What Is Temperature Of Fever? Comprehensive Guide

What Is Temperature Of Fever? Understanding fever temperatures is crucial for effective health management, and WHAT.EDU.VN is here to provide clarity. This guide offers insights into fever ranges, symptoms, and when to seek medical attention, helping you make informed decisions about your health using our comprehensive resources. Explore the depths of fever, hyperthermia, and pyrexia.

1. Defining Fever: Understanding Body Temperature

What is temperature of fever, and how do we define it? A fever is a temporary increase in your body’s temperature, often due to an illness. It’s a natural response by your body’s immune system to fight off infections. Understanding what constitutes a fever and its underlying causes is crucial for managing your health effectively.

1.1. Normal Body Temperature Range

Normal body temperature typically hovers around 98.6°F (37°C), but it can vary throughout the day and from person to person. Factors such as activity level, time of day, and age can influence these fluctuations.

Factors Affecting Body Temperature:
- Time of Day: Body temperature is usually lower in the morning and higher in the late afternoon and evening.
- Activity Level: Exercise and physical activity can raise body temperature.
- Age: Infants and young children may have slightly higher normal temperatures compared to adults.
- Menstrual Cycle: Women may experience changes in body temperature during their menstrual cycle.

1.2. What Constitutes a Fever?

A fever is generally defined as a body temperature of 100.4°F (38°C) or higher when taken orally. Rectal temperatures are typically 0.5 to 1°F higher than oral temperatures, while axillary (armpit) temperatures are usually 0.5 to 1°F lower.

Fever Thresholds:
- Oral Temperature: 100.4°F (38°C) or higher
- Rectal Temperature: 101°F (38.3°C) or higher
- Axillary Temperature: 99.4°F (37.4°C) or higher

1.3. Low-Grade vs. High-Grade Fevers

Fevers are often categorized based on their severity. A low-grade fever is typically between 100.4°F (38°C) and 102.2°F (39°C), while a high-grade fever is generally above 102.2°F (39°C). Very high fevers, exceeding 104°F (40°C), require immediate medical attention.

Fever Grade	Temperature Range	Symptoms	Action
Low-Grade	100.4°F (38°C) – 102.2°F (39°C)	Mild discomfort, sweating, chills	Rest, drink fluids, monitor symptoms
High-Grade	Above 102.2°F (39°C)	Increased discomfort, possible headache, muscle aches	Rest, drink fluids, consider medication, monitor closely
Very High	Above 104°F (40°C)	Severe discomfort, confusion, possible seizures	Seek immediate medical attention

1.4. Common Causes of Fever

Fevers are usually caused by infections, such as viral or bacterial illnesses. Common causes include:

Viral Infections: Colds, flu, and other respiratory infections
Bacterial Infections: Strep throat, urinary tract infections (UTIs), and pneumonia
Vaccinations: Some vaccines can cause a temporary fever
Other Causes: Heat exhaustion, certain medications, and underlying medical conditions

2. Symptoms Associated with Fever

What is temperature of fever symptoms? Beyond just an elevated body temperature, fevers often come with a range of other symptoms. Recognizing these associated signs can help you better understand and manage your condition.

2.1. Common Symptoms Accompanying Fever

When your body temperature rises, you might experience several accompanying symptoms:

Sweating: Your body tries to cool down by producing sweat.
Chills and Shivering: These occur as your body attempts to generate heat to reach the elevated temperature.
Headache: Often a result of inflammation or muscle tension.
Muscle Aches: Common during infections, causing discomfort and soreness.
Weakness and Fatigue: Your body expends more energy fighting off the infection, leading to tiredness.
Loss of Appetite: Feeling unwell can reduce your desire to eat.

2.2. Recognizing Symptoms in Children

Children may exhibit symptoms differently than adults. Common signs of fever in children include:

Irritability and Fussiness: They may become more cranky and difficult to soothe.
Lethargy: Reduced activity level and increased sleepiness.
Poor Feeding: Refusal to eat or drink.
Warm to the Touch: Feeling noticeably warm when touched.
Flushed Skin: Redness in the face and body.

2.3. When to Seek Medical Attention

While many fevers can be managed at home, certain symptoms warrant medical attention:

High Fever: Temperatures above 103°F (39.4°C) in adults or 102°F (39°C) in children.
Severe Headache: Especially if accompanied by stiff neck, confusion, or sensitivity to light.
Difficulty Breathing: Shortness of breath or rapid breathing.
Chest Pain: Discomfort or pressure in the chest.
Persistent Vomiting: Inability to keep down fluids.
Seizures: Uncontrolled shaking or jerking movements.
Confusion or Disorientation: Difficulty thinking clearly or knowing where you are.
Severe Abdominal Pain: Intense pain in the stomach area.
Rash: Especially if it appears suddenly or is accompanied by other symptoms.

2.4. Symptoms Indicating Serious Conditions

Certain symptoms may indicate a more serious underlying condition:

Stiff Neck: Could indicate meningitis.
Sensitivity to Light: May also suggest meningitis or other infections.
Confusion: Can be a sign of severe infection or dehydration.
Seizures: Could indicate a serious neurological issue.
Difficulty Breathing: May indicate pneumonia or other respiratory problems.
Severe Abdominal Pain: Possible sign of appendicitis or other serious abdominal conditions.

3. Measuring Body Temperature Accurately

What is temperature of fever accurate measurement? Accurate measurement of body temperature is essential for determining if a fever is present and monitoring its progression. Different methods and devices are available, each with its own advantages and disadvantages.

3.1. Different Methods of Temperature Measurement

There are several ways to measure body temperature, including:

Oral: Using a thermometer in the mouth.
Rectal: Inserting a thermometer into the rectum.
Axillary (Armpit): Placing a thermometer under the armpit.
Tympanic (Ear): Using a special thermometer to measure temperature in the ear canal.
Temporal Artery (Forehead): Scanning the forehead with a temporal artery thermometer.

3.2. Types of Thermometers Available

Various types of thermometers are available for measuring body temperature:

Digital Thermometers: These are the most common and can be used orally, rectally, or under the armpit.
Tympanic Thermometers: Designed for use in the ear canal and provide quick readings.
Temporal Artery Thermometers: These scan the forehead and are non-invasive.
Mercury Thermometers: Although accurate, they are less common due to safety concerns about mercury exposure.

3.3. Step-by-Step Guide to Taking Temperature

Here’s a step-by-step guide for taking temperature using different methods:

Oral Temperature:

Wash your hands with soap and water.
Ensure the person has not eaten or drank anything hot or cold for at least 15 minutes.
Place the thermometer tip under the tongue.
Instruct the person to close their mouth and breathe through their nose.
Wait for the thermometer to beep or signal that it’s done (usually about 1 minute for digital thermometers).
Read the temperature on the display.

Rectal Temperature:

Wash your hands with soap and water.
Lubricate the tip of the thermometer with petroleum jelly.
Position the infant or child face down on your lap or a flat surface.
Gently insert the thermometer about 1 inch into the rectum.
Hold the thermometer in place until it beeps or signals that it’s done (usually about 1 minute for digital thermometers).
Remove the thermometer and read the temperature on the display.
Clean the thermometer thoroughly with soap and water.

Axillary (Armpit) Temperature:

Wash your hands with soap and water.
Place the thermometer tip under the armpit, ensuring it touches the skin.
Instruct the person to hold their arm tightly against their body.
Wait for the thermometer to beep or signal that it’s done (usually about 2-3 minutes for digital thermometers).
Read the temperature on the display.

Tympanic (Ear) Temperature:

Wash your hands with soap and water.
Gently pull the ear back and upward (for adults) or back and downward (for children).
Insert the thermometer tip into the ear canal.
Press the scan button and wait for the thermometer to beep or signal that it’s done (usually just a few seconds).
Read the temperature on the display.

Temporal Artery (Forehead) Temperature:

Wash your hands with soap and water.
Gently slide the thermometer across the forehead, from one side to the other, keeping the sensor in contact with the skin.
Press the scan button and wait for the thermometer to beep or signal that it’s done (usually just a few seconds).
Read the temperature on the display.

3.4. Tips for Accurate Readings

To ensure accurate temperature readings:

Use the Correct Method: Choose the appropriate method based on age and situation.
Follow Instructions: Read and follow the manufacturer’s instructions for your thermometer.
Wait Before Measuring: Avoid taking oral temperatures immediately after eating or drinking.
Clean Thermometer: Clean the thermometer before and after each use with soap and water or rubbing alcohol.
Stay Still: Ensure the person stays still during the measurement to avoid inaccurate readings.
Calibrate Regularly: If possible, calibrate your thermometer to ensure accuracy.

Alt text: A close-up view of a digital thermometer displaying a temperature reading, demonstrating a tool used for measuring body temperature and detecting fever.

4. Managing Fever at Home

What is temperature of fever home management? In many cases, fevers can be effectively managed at home with simple care strategies. Knowing how to reduce discomfort and support the body’s natural healing process is key.

4.1. When Home Care Is Appropriate

Home care is generally appropriate for low to moderate fevers (100.4°F to 102°F) accompanied by mild symptoms. If the person is alert, responsive, and comfortable, home management is often sufficient.

4.2. Effective Home Remedies for Fever

Several home remedies can help alleviate fever symptoms:

Rest: Get plenty of rest to allow your body to focus on healing.
Hydration: Drink plenty of fluids like water, clear broths, and electrolyte solutions to prevent dehydration.
Cool Compress: Apply a cool, damp cloth to the forehead or neck to help lower body temperature.
Lukewarm Bath: A lukewarm bath can help reduce fever, but avoid cold water as it can cause shivering.
Light Clothing: Wear lightweight, breathable clothing to help your body cool down.
Avoid Overexertion: Refrain from strenuous activities until the fever subsides.

4.3. Medications for Fever Reduction

Over-the-counter medications can help reduce fever and alleviate associated symptoms:

Acetaminophen (Tylenol): Effective for reducing fever and relieving pain. Follow dosage instructions carefully.
Ibuprofen (Advil, Motrin): Also effective for reducing fever and relieving pain. Not recommended for infants under 6 months.
Aspirin: Effective for adults, but not recommended for children due to the risk of Reye’s syndrome.

4.4. Important Considerations When Using Medications

Dosage: Always follow the recommended dosage instructions on the label or as directed by a healthcare provider.
Age Appropriateness: Ensure the medication is appropriate for the age of the person taking it.
Frequency: Do not exceed the recommended frequency of doses.
Other Medications: Be aware of potential interactions with other medications.
Underlying Conditions: Consult a healthcare provider if the person has underlying health conditions.

4.5. Monitoring Symptoms and Progression

Regularly monitor the person’s symptoms and temperature to track the fever’s progression. Look for any signs of worsening or new symptoms that may require medical attention.

5. When to Seek Professional Medical Advice

What is temperature of fever warranting medical advice? While many fevers are harmless and resolve on their own, knowing when to seek professional medical advice is critical for preventing complications.

5.1. Danger Signs That Require Immediate Attention

Certain signs and symptoms accompanying a fever warrant immediate medical attention:

High Fever: Temperature above 104°F (40°C)
Seizures: Uncontrolled shaking or jerking movements
Difficulty Breathing: Shortness of breath or rapid breathing
Severe Headache: Especially if accompanied by stiff neck or sensitivity to light
Confusion or Disorientation: Difficulty thinking clearly or knowing where you are
Severe Abdominal Pain: Intense pain in the stomach area
Persistent Vomiting: Inability to keep down fluids
Rash: Especially if it appears suddenly or is accompanied by other symptoms

5.2. When to Consult a Doctor for Children

For children, consult a doctor in the following situations:

Infants Under 3 Months: Any fever should be evaluated by a doctor.
Children 3-6 Months: Fever above 101°F (38.3°C)
Children 6 Months or Older: High fever (above 102°F or 39°C) or if the child appears very ill
Any Age: Fever accompanied by lethargy, poor feeding, difficulty breathing, or seizures

5.3. When to Consult a Doctor for Adults

Adults should consult a doctor in the following situations:

High Fever: Temperature above 103°F (39.4°C)
Severe Symptoms: Severe headache, stiff neck, difficulty breathing, or confusion
Underlying Conditions: If you have a chronic medical condition such as diabetes, heart disease, or a weakened immune system
Prolonged Fever: Fever lasting more than a few days

5.4. Preparing for a Doctor’s Visit

To make the most of your doctor’s visit, prepare the following information:

Symptoms: List all symptoms and when they started.
Temperature History: Record temperature readings and times.
Medications: List all medications you are currently taking.
Medical History: Provide relevant medical history and any known allergies.
Questions: Write down any questions you have for the doctor.

6. Understanding Different Types of Fevers

What is temperature of fever classifications? Fevers can be classified based on their pattern, duration, and underlying cause. Understanding these different types can provide insights into the nature of the illness.

6.1. Intermittent Fever

Intermittent fever is characterized by periods of elevated temperature alternating with periods of normal temperature each day.

Characteristics: Temperature spikes and returns to normal within the same day.
Possible Causes: Infections such as malaria, sepsis, or abscesses.

6.2. Remittent Fever

Remittent fever involves a fluctuating temperature that remains above normal throughout the day, with variations of more than 0.36°F (0.2°C) but never returning to normal.

Characteristics: Temperature fluctuates but remains elevated.
Possible Causes: Infections such as typhoid fever or infective endocarditis.

6.3. Continuous Fever

Continuous fever is marked by a consistently elevated temperature with minimal fluctuations throughout the day (less than 0.36°F or 0.2°C).

Characteristics: Temperature remains consistently high.
Possible Causes: Lobar pneumonia, typhoid fever, or urinary tract infections.

6.4. Relapsing Fever

Relapsing fever is characterized by episodes of fever lasting several days, followed by periods of normal temperature, and then recurring episodes of fever.

Characteristics: Episodes of fever interspersed with periods of normal temperature.
Possible Causes: Borrelia infections such as Lyme disease or relapsing fever.

6.5. Hectic Fever

Hectic fever involves wide variations in temperature throughout the day, often associated with chills and sweating.

Characteristics: Large temperature fluctuations with chills and sweating.
Possible Causes: Tuberculosis or septicemia.

Alt text: A young child lying down with a cool compress on their forehead, illustrating a common method for reducing fever and providing comfort.

7. Fever in Infants and Young Children

What is temperature of fever in children? Fevers in infants and young children require special attention due to their vulnerability and potential for rapid changes in condition.

7.1. Unique Considerations for Infants

Infants have a less developed immune system and may not exhibit the same symptoms as older children or adults.

Immature Immune System: Infants are more susceptible to infections.
Difficulty Communicating: They cannot describe their symptoms.
Rapid Dehydration: Infants can become dehydrated quickly.

7.2. When to Seek Immediate Medical Attention for Infants

Any fever in an infant under 3 months old should be evaluated by a doctor immediately. For infants 3-6 months, seek medical attention for a fever above 101°F (38.3°C).

7.3. Safe Methods for Reducing Fever in Children

Acetaminophen (Tylenol): Use the correct dosage based on the child’s weight and age.
Ibuprofen (Advil, Motrin): Not recommended for infants under 6 months old.
Lukewarm Bath: Sponge the child with lukewarm water, avoiding cold water.
Light Clothing: Dress the child in lightweight, breathable clothing.
Hydration: Encourage the child to drink plenty of fluids.

7.4. Medications to Avoid in Children

Aspirin: Not recommended for children due to the risk of Reye’s syndrome.
Cough and Cold Medicines: Avoid giving cough and cold medicines to children under 4 years old unless directed by a doctor.

8. Fever vs. Hyperthermia

What is temperature of fever versus hyperthermia? It’s essential to distinguish between fever and hyperthermia, as they have different causes and require different management strategies.

8.1. Definition of Hyperthermia

Hyperthermia is an abnormally high body temperature caused by failed thermoregulation. Unlike fever, it is not caused by an infection or an immune response.

8.2. Causes of Hyperthermia

Heatstroke: Prolonged exposure to high temperatures, leading to the body’s inability to regulate temperature.
Exercise-Induced Hyperthermia: Overexertion during physical activity in hot environments.
Drug-Induced Hyperthermia: Certain medications can interfere with the body’s temperature regulation.
Malignant Hyperthermia: A rare, life-threatening reaction to certain anesthesia medications.

8.3. Key Differences Between Fever and Hyperthermia

Feature	Fever	Hyperthermia
Cause	Infection, immune response	Failed thermoregulation due to external factors or certain medications
Mechanism	Body’s thermostat (hypothalamus) is reset to a higher temperature	Body’s temperature rises due to external heat or impaired heat dissipation
Treatment	Treat underlying infection, antipyretics (fever-reducing medications)	Cooling measures, addressing the underlying cause (e.g., heatstroke, drug reaction)
Response to Antipyretics	Typically responds to antipyretics	Does not respond to antipyretics

8.4. Management Strategies for Hyperthermia

Cooling Measures: Rapidly cooling the body with ice packs, cold water immersion, or evaporative cooling techniques.
Hydration: Replenishing fluids and electrolytes.
Addressing Underlying Cause: Identifying and treating the cause of hyperthermia, such as heatstroke or drug reaction.
Medical Monitoring: Closely monitoring vital signs and organ function.

9. The Role of Fever in the Immune Response

What is temperature of fever immune response? Fever plays a crucial role in the body’s immune response, helping to fight off infections and promote healing.

9.1. How Fever Enhances Immune Function

Increased Metabolic Rate: Fever increases the body’s metabolic rate, accelerating immune processes.
Enhanced White Blood Cell Activity: Higher temperatures improve the ability of white blood cells to fight infection.
Inhibition of Pathogen Growth: Fever can inhibit the growth and replication of bacteria and viruses.
Activation of Immune Proteins: Fever stimulates the production and activity of immune proteins such as interferon.

9.2. The Body’s Natural Defense Mechanism

Fever is a natural defense mechanism that helps the body combat infections more effectively. It is a sign that the immune system is actively working to fight off pathogens.

9.3. When to Let a Fever Run Its Course

In some cases, it may be beneficial to allow a low-grade fever to run its course, as it can enhance the immune response. However, it’s important to monitor symptoms and ensure the person remains comfortable.

9.4. Supporting the Body’s Healing Process

Rest: Get plenty of rest to allow the body to focus on healing.
Hydration: Drink plenty of fluids to prevent dehydration.
Nutrition: Eat nutritious foods to support immune function.
Avoid Stress: Reduce stress to promote healing.

10. Fever-Related Complications

What is temperature of fever complications? Although fever is often a beneficial response, it can sometimes lead to complications, especially in vulnerable populations.

10.1. Dehydration

Fever can lead to increased fluid loss through sweating and rapid breathing, increasing the risk of dehydration.

Symptoms: Dry mouth, decreased urination, dizziness, and fatigue.
Prevention: Drink plenty of fluids, such as water, clear broths, and electrolyte solutions.

10.2. Febrile Seizures

Febrile seizures are seizures triggered by fever in infants and young children.

Characteristics: Uncontrolled shaking or jerking movements.
Risk Factors: Family history of febrile seizures, high fever, and rapid temperature rise.
Management: Protect the child from injury during the seizure and seek medical attention.

10.3. Delirium and Confusion

High fever can sometimes cause delirium and confusion, especially in older adults.

Symptoms: Disorientation, agitation, hallucinations, and impaired cognitive function.
Management: Seek medical attention and provide a calm, safe environment.

10.4. Exacerbation of Underlying Conditions

Fever can worsen underlying medical conditions such as heart disease, respiratory problems, and neurological disorders.

Management: Monitor symptoms closely and consult a healthcare provider.

11. Debunking Common Fever Myths

What is temperature of fever debunking myths? Many misconceptions surround fever. Separating fact from fiction is essential for making informed decisions about fever management.

11.1. Myth: All Fevers Are Dangerous

Fact: Most fevers are not dangerous and are a natural part of the body’s immune response.

11.2. Myth: High Fever Causes Brain Damage

Fact: Fever alone rarely causes brain damage. Brain damage is usually associated with very high fevers (above 107.6°F or 42°C) that are sustained for a prolonged period.

11.3. Myth: Fever Should Always Be Treated

Fact: Not all fevers need to be treated, especially if they are low-grade and the person is comfortable. Treating a fever is primarily aimed at relieving discomfort.

11.4. Myth: Cold Baths Are the Best Way to Reduce Fever

Fact: Cold baths can cause shivering, which can raise the body’s core temperature. Lukewarm baths are more effective.

11.5. Myth: If You Break a Fever, You’re Cured

Fact: Breaking a fever only means the body temperature has temporarily returned to normal. The underlying cause of the fever still needs to be addressed.

12. Preventive Measures to Reduce Fever Risk

What is temperature of fever prevention? Taking preventive measures can help reduce the risk of developing fevers and related infections.

12.1. Practicing Good Hygiene

Handwashing: Wash hands frequently with soap and water, especially after using the restroom, before eating, and after being in public places.
Covering Coughs and Sneezes: Use a tissue to cover your mouth and nose when coughing or sneezing, and dispose of the tissue properly.
Avoiding Touching Face: Avoid touching your eyes, nose, and mouth to prevent the spread of germs.

12.2. Staying Up-to-Date with Vaccinations

Vaccinations can protect against many infections that cause fever, such as influenza, measles, and chickenpox.

12.3. Maintaining a Healthy Lifestyle

Balanced Diet: Eat a nutritious diet rich in fruits, vegetables, and whole grains to support immune function.
Regular Exercise: Engage in regular physical activity to boost the immune system.
Adequate Sleep: Get enough sleep to allow the body to recover and strengthen its defenses.

12.4. Avoiding Close Contact with Sick Individuals

Limit close contact with people who are sick to reduce the risk of infection.

13. Fever and Coexisting Health Conditions

What is temperature of fever with other conditions? Managing fever can be more complex when coexisting health conditions are present, requiring careful consideration and tailored strategies.

13.1. Impact of Chronic Diseases on Fever Management

Chronic diseases such as diabetes, heart disease, and respiratory problems can affect how the body responds to fever and may require adjustments in management.

13.2. Specific Considerations for Immunocompromised Individuals

Individuals with weakened immune systems, such as those undergoing chemotherapy or living with HIV/AIDS, are more vulnerable to infections and may require more aggressive treatment for fever.

13.3. Tailoring Treatment Plans

Healthcare providers need to tailor treatment plans to address both the fever and the underlying health conditions, taking into account potential interactions between medications and other therapies.

13.4. Monitoring for Complications

Close monitoring for complications is essential in individuals with coexisting health conditions, as they may be at higher risk for adverse outcomes.

14. Fever and Travel

What is temperature of fever related to travel? Traveling to different regions can expose individuals to new infections and diseases, leading to fever.

14.1. Travel-Related Infections That Cause Fever

Malaria: Transmitted by mosquitoes in tropical regions.
Dengue Fever: Also transmitted by mosquitoes in tropical and subtropical areas.
Typhoid Fever: Spread through contaminated food and water.
Zika Virus: Transmitted by mosquitoes and can cause fever, rash, and joint pain.

14.2. Preventive Measures Before and During Travel

Vaccinations: Get recommended vaccinations before traveling to certain regions.
Mosquito Protection: Use insect repellent, wear long sleeves and pants, and sleep under mosquito nets.
Safe Food and Water Practices: Drink bottled or treated water and eat only thoroughly cooked food.

14.3. Seeking Medical Attention While Traveling

If you develop a fever while traveling, seek medical attention as soon as possible. Be sure to inform the healthcare provider about your travel history.

14.4. Post-Travel Evaluation for Persistent Fever

If you experience a persistent fever after returning from travel, consult a healthcare provider for evaluation and testing.

15. Future Trends in Fever Management

What is temperature of fever future trends? Advances in technology and medical research are shaping the future of fever management, offering new tools and strategies for prevention, diagnosis, and treatment.

15.1. Advancements in Thermometry

Wearable Temperature Sensors: Continuous temperature monitoring through wearable devices.
Smartphone-Based Thermometers: Integration of thermometers with smartphone apps for easy tracking and data analysis.

15.2. Diagnostic Technologies

Rapid Diagnostic Tests: Faster and more accurate tests for identifying the cause of fever.
Point-of-Care Diagnostics: Diagnostic tools that can be used at the bedside or in the field.

15.3. Personalized Treatment Approaches

Genomic Testing: Using genomic information to tailor treatment plans based on individual characteristics.
Precision Medicine: Developing targeted therapies that address the underlying cause of fever more effectively.

15.4. Telemedicine and Remote Monitoring

Virtual Consultations: Remote consultations with healthcare providers for fever management.
Remote Monitoring Systems: Monitoring patients’ temperature and symptoms remotely to detect early signs of complications.

WHAT.EDU.VN is committed to providing you with reliable and accessible health information. We understand that finding quick and trustworthy answers can be challenging, which is why we offer a free platform for all your questions. Don’t hesitate to ask – we’re here to help Address: 888 Question City Plaza, Seattle, WA 98101, United States. Whatsapp: +1 (206) 555-7890. Website: WHAT.EDU.VN. Need answers? Visit what.edu.vn today and ask your question.