When to seek care for fever

Overview

Fever is a temporary rise in your body temperature, usually because your body is fighting an infection. A normal temperature is around 37°C (98.6°F). A fever is generally considered a temperature of 38°C (100.4°F) or higher.

Yes, fever is one of the most common reasons people visit a doctor or a pharmacist. Almost everyone will experience a fever at some point.

Fever can affect people of all ages, but children, older adults, and those with weakened immune systems are more likely to have complications.

Symptoms

Common symptoms

• High body temperature (38°C or higher)
• Chills and shivering
• Sweating
• Headache
• Muscle aches
• Feeling tired or weak
• Loss of appetite

Symptoms in children

• Irritability or fussiness
• Poor feeding or not drinking enough
• Warm, flushed skin
• Rapid breathing or fast heart rate
• Vomiting or diarrhea

Symptoms in older adults

• Low-grade fever (may not be as high as in younger people)
• Confusion or changes in mental state
• Weakness or lethargy
• Loss of appetite
• Difficulty moving or getting out of bed

Causes

Main causes

• Infections – such as colds, flu, ear infections, chest infections, or urinary tract infections
• Inflammation – from conditions like rheumatoid arthritis or inflammatory bowel disease
• Heat exhaustion or heatstroke
• Reaction to certain medicines or vaccines
• Immunizations in children (mild fever is common)

Risk factors

• Being very young (especially under 6 months) or elderly
• Having a chronic illness like diabetes, heart disease, or lung disease
• Having a weakened immune system
• Recent surgery or hospital stay
• Travel to areas with certain infections (e.g., malaria)

When to see a doctor

See a doctor urgently if:

• If you have any of the emergency symptoms listed above (call emergency services immediately)
• If you have a fever and a weakened immune system
• If a baby under 3 months has a fever
• If fever is accompanied by a severe headache, stiff neck, or rash
• If you have trouble breathing or chest pain

Book a routine appointment if:

• If fever lasts more than 3 days without improving
• If you have repeated fevers (coming and going over weeks)
• If you have other concerning symptoms that do not go away
• If you are unsure about your symptoms or feel worried

Diagnosis

Your doctor will ask about your symptoms, medical history, and any recent travel or exposures. They will take your temperature and may check your heart rate, breathing, and other vital signs. The doctor will also examine you for signs of infection (such as redness, swelling, or tenderness).

Tests that may be done

• Blood tests (to check for infection or inflammation)
• Urine test (to look for a urinary tract infection)
• Chest X-ray (if pneumonia is suspected)
• Throat swab (if strep throat is possible)
• Other tests based on your symptoms

What to expect at your appointment

The doctor will ask you about the fever pattern, other symptoms, and any medicines you are taking. They may also ask about your vaccination history. Based on the evaluation, they will give you advice on how to manage the fever and whether you need further tests or treatment.

Treatment

Treatment depends on the cause of the fever. Most fevers from viral infections do not need specific medical treatment – they go away on their own. The goal is to keep you comfortable and prevent dehydration. For bacterial infections, your doctor may prescribe antibiotics.

Self-care at home

• Get plenty of rest
• Drink lots of fluids (water, clear soups, electrolyte drinks) to prevent dehydration
• Wear light clothing and keep the room at a comfortable temperature
• Use a cool, damp cloth on your forehead or wrists to help cool down
• Take over-the-counter fever-reducing medicines as directed by your pharmacist (do not exceed the recommended dose)

Medical treatments

If your doctor finds a bacterial infection, they may prescribe antibiotics. Sometimes antiviral medicines are used for specific viral infections (like flu). In hospital, intravenous fluids may be given if you are dehydrated. Always follow your doctor’s advice – never take antibiotics for a viral infection.

When is surgery considered?

Surgery is not needed for fever itself. If an infection requires surgical drainage (for example, an abscess), that would be treated separately.

Living with this condition

Monitor your temperature once or twice a day, especially if you feel unwell. Rest as much as you can, and stay hydrated. Most fevers last 2 to 3 days. If you are caring for a child with a fever, check them regularly and ensure they are drinking enough.

Lifestyle tips

• Get plenty of sleep while you recover
• Avoid heavy exercise or strenuous activity until the fever is gone
• Wash your hands frequently to avoid spreading any infection
• Avoid sharing cups, towels, or utensils
• Keep your living space well-ventilated

Diet and exercise

Eat light, easy-to-digest foods like soups, toast, or bananas. Avoid fatty or spicy foods. Do not force yourself to eat if you feel sick. Drink at least 8 glasses of water or clear fluids a day. Resume normal exercise only after your fever has completely gone and you feel better.

Mental health and emotional wellbeing

Having a fever can be worrying, especially if it lasts a long time. Remember that fever is a normal part of fighting infection. If you feel anxious, talk to a trusted friend or your doctor. For children, fevers can be frightening for parents, but most are harmless. Trust your instincts – if you are concerned, seek advice.

Prevention

You cannot prevent all fevers, but you can reduce your risk of infections that cause fever. Good hygiene is key.

Vaccines

Vaccines protect against many infections that cause fever, such as flu, measles, and pneumococcal disease. Stay up to date with your vaccinations as recommended by your healthcare provider.

Screening programmes

There is no routine screening for fever itself. However, if you have a medical condition that weakens your immune system, your doctor may monitor you more closely.

Complications

If left untreated

• Dehydration (especially in children and older adults)
• Febrile seizures in young children (usually harmless but alarming)
• Worsening of an underlying infection (e.g., pneumonia or sepsis)
• Rarely, prolonged high fever can cause organ damage

Long-term outlook

The vast majority of fevers resolve without any lasting problems. With proper self-care and medical attention when needed, you can expect a full recovery. Even serious infections are usually treatable. If you have any concerns, your healthcare team is there to help.

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