Fever: Symptoms, Causes & When to Seek Care

Overview

A fever is when your body temperature is higher than normal. It is often a sign that your body is naturally fighting off an infection.

Understanding fever temperatures

A normal body temperature varies between people and fluctuates throughout the day. However, a temperature of 38°C (100.4°F) or above is commonly considered a fever in adults.

Keep in mind that the measurement method matters (oral, armpit, forehead, or ear). More importantly, you should not obsess over a single number. Your symptoms and how you feel overall are just as important as the reading on the thermometer.

How to check your temperature

Using a digital thermometer is the most reliable way to check your temperature. When you measure:

Note exactly where the temperature was measured (e.g., under the tongue or under the armpit), as different sites have varying levels of accuracy.

Record the exact temperature reading along with the measurement method.

Do not compare readings from different methods as if they are identical.

Common causes of fever

Fever is not an illness itself, but a symptom. It usually means your body is responding to something. Major categories include:

Viral infections — such as the common cold, the flu, and other viral illnesses.
Bacterial infections — which can occur in various parts of the body (like the throat, urinary tract, or lungs).
Other causes — including inflammatory conditions, heat exhaustion, and certain medicines.

Recognising viral fever symptoms

While "viral fever" is not one specific diagnosis, viral illnesses often share a common set of symptoms. If you have a viral fever, you might experience combinations of:

Fever and chills
Headache
Body or muscle aches
Tiredness and fatigue
Cough, sore throat, or runny nose
Reduced appetite

Note: Symptoms alone cannot reliably tell you whether a fever is viral or bacterial. A doctor may need to review your history, perform an examination, and sometimes order tests to find the exact cause.

Fever with cough or sore throat?

These are common respiratory symptoms. Read more about:

Cough & Cold Sore Throat

Fever with digestive symptoms?

If your fever is accompanied by abdominal discomfort or loose stools, check out:

Stomach Pain Diarrhoea & Loose Motions

Home treatment for fever

If your fever is mild and you do not have severe symptoms, you can often manage it at home. Key steps include:

Rest to give your immune system energy to fight the illness.
Drink plenty of fluids (water, clear broths, oral rehydration solutions) to prevent dehydration.
Keep your room comfortably cool and wear lightweight clothing.
Do not use cold baths or alcohol rubs, as these can cause shivering, which actually raises your core body temperature.

Safe paracetamol usage

Paracetamol can help lower a fever and relieve body aches. When using paracetamol:

Do not exceed the maximum daily dose (usually 4 grams per day for healthy adults, which is eight 500mg tablets, or four 1000mg tablets, spaced out over 24 hours).
Wait at least 4 to 6 hours between doses.
Check other medicines you are taking, such as cold-and-flu remedies, to ensure they do not also contain paracetamol.
Do not use paracetamol if you have liver disease or are advised against it by a doctor.

When to seek medical help

A fever is usually not dangerous in a healthy adult, but you should consult a doctor if:

Your temperature reaches 39.4°C (103°F) or higher.
Your fever lasts longer than 3 days.
Your symptoms worsen instead of improving.
You have a weakened immune system, significant underlying health conditions, or are pregnant.

Emergency warning signs

Call 112 or go to the nearest emergency room immediately if your fever is accompanied by any of these "red flag" symptoms:

Difficulty breathing or chest pain
Confusion, unusual drowsiness, or extreme irritability
Severe headache or stiff neck
Seizures
Persistent vomiting
Severe abdominal pain
Significant rash
Severe dehydration

Fever in India: when online consultation may help

In India, fever can accompany many common infections, and local epidemiology matters. However, not every fever requires testing for specific local diseases immediately.

During an online consultation, a doctor may ask about your recent travel, mosquito exposure, sick contacts, food and water exposure, urinary symptoms, cough, rash, medications, and exactly how long the fever has lasted. This detailed history helps the doctor advise you on whether home care is safe or if you need specific tests and an in-person visit.

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Receive medical advice, a prescription if appropriate, or a referral for in-person care.

Frequently asked questions

What temperature is considered a fever?

A temperature of 38°C (100.4°F) or above is generally considered a fever in adults.

What are the symptoms of viral fever?

Common symptoms include high temperature, chills, headache, body aches, fatigue, and sometimes a cough or sore throat depending on the specific virus.

How can I reduce fever at home?

Rest, stay well-hydrated, wear comfortable clothing, and take paracetamol if needed. Avoid using heavy blankets that can trap heat and raise your temperature further.

Can I take paracetamol for fever?

Yes, paracetamol can reduce discomfort and lower your temperature. Always follow the package instructions and avoid taking multiple medicines containing paracetamol at the same time.

How long does a fever usually last?

Most viral fevers resolve within a few days. However, if your fever lasts for more than 3 days, you should consult a doctor.

When should I see a doctor for fever?

You should consult a doctor if your fever reaches 39.4°C (103°F) or higher, lasts more than 3 days, is accompanied by severe symptoms, or if you have a weakened immune system.

When is fever an emergency?

It is a medical emergency if your fever is accompanied by difficulty breathing, chest pain, confusion, a stiff neck, seizures, severe abdominal pain, or persistent vomiting. In such cases, seek immediate medical attention or call 112.

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Medical References

The medical information on this page is informed by clinical guidance and health resources from the Indian Council of Medical Research (ICMR), Ministry of Health and Family Welfare (MoHFW) and National Centre for Disease Control (NCDC), along with established international medical references where appropriate. This content is for informational purposes and does not substitute for professional medical advice.