heart with fever

Overview

A heart with fever usually means there is an infection or inflammation affecting the heart or its lining. This can be a condition such as endocarditis (infection of the heart's inner lining), myocarditis (inflammation of the heart muscle), or pericarditis (inflammation of the sac around the heart). The fever is the body's way of fighting the infection or inflammation.

Heart infections are not common. They occur in a small number of people, especially those with pre-existing heart conditions or weakened immune systems.

It can affect anyone, but people with artificial heart valves, congenital heart defects, a history of IV drug use, or a recent dental or surgical procedure that introduced bacteria into the bloodstream are at higher risk.

Symptoms

Common symptoms

• Fever (temperature above 100.4°F or 38°C) that lasts for days
• Chest pain, often sharp and worse when breathing or lying down
• Shortness of breath
• Feeling very tired or weak
• Rapid or irregular heartbeat

Symptoms in children

• Fever with poor feeding or refusal to eat
• Irritability or unusual fussiness
• Rapid breathing or grunting
• Pale or bluish skin

Symptoms in older adults

• Fever that may be lower than expected
• Confusion or sudden change in mental state
• Loss of appetite
• Shortness of breath with light activity

Causes

Main causes

• Bacterial infection entering the bloodstream and settling in the heart (endocarditis)
• Viral infection causing inflammation of the heart muscle (myocarditis)
• Autoimmune reaction where the body attacks the heart lining (pericarditis)

Risk factors

• Damaged or artificial heart valves
• Congenital heart disease
• Recent dental work or surgery without antibiotics
• IV drug use
• Weakened immune system (e.g., from chemotherapy or HIV)
• Being over 60 years old

When to see a doctor

See a doctor urgently if:

• Any fever combined with chest pain or trouble breathing
• Fever that comes back after a recent illness or procedure
• Rapid or fluttering heartbeat with fever

Book a routine appointment if:

• Persistent low-grade fever (around 100–101°F or 38°C) for more than a week
• Unexplained fatigue and muscle aches with a mild fever

Diagnosis

Your doctor will ask about your symptoms, listen to your heart, and check for signs of infection or inflammation.

Tests that may be done

• Blood tests (to look for signs of infection or inflammation)
• Electrocardiogram (ECG) to check heart rhythm
• Echocardiogram (ultrasound of the heart) to look at heart valves and structure
• Chest X-ray to see if your heart is enlarged or lungs are affected

What to expect at your appointment

Most tests are painless and quick. If an infection is suspected, you may need to stay in the hospital for further monitoring and treatment.

Treatment

Treatment depends on the cause—bacterial infections need strong antibiotics, while viral or autoimmune inflammation may be treated with anti-inflammatory medicines. Early treatment helps prevent damage to the heart.

Self-care at home

• Rest completely until symptoms improve
• Drink plenty of fluids to stay hydrated
• Take over-the-counter fever reducers (like paracetamol) as recommended by your doctor
• Avoid strenuous activity until your heart recovers

Medical treatments

For bacterial endocarditis, you will receive antibiotics through a vein (intravenous) in the hospital, often for several weeks. For myocarditis or pericarditis, doctors may prescribe anti-inflammatory medicines or medications to help your heart pump better. Never share or change your medicines without talking to your doctor.

When is surgery considered?

Surgery may be needed if a heart valve is severely damaged by infection and does not work properly. This is uncommon and only done after careful evaluation.

Living with this condition

After treatment, you may need to take it easy for a few weeks or months. Most people recover fully and can return to normal activities gradually.

Lifestyle tips

• Get plenty of sleep and rest
• Avoid smoking and excessive alcohol
• Keep up with follow-up appointments and blood tests
• Brush and floss teeth regularly to prevent bacteria from entering your bloodstream

Diet and exercise

Eat a heart-healthy diet with fruits, vegetables, whole grains, and lean proteins. Avoid salty foods. Start light exercise only after your doctor says it is safe—usually after all symptoms are gone.

Mental health and emotional wellbeing

Dealing with a heart infection can be stressful and scary. It is normal to feel anxious or down. Talk to your healthcare team if you feel overwhelmed. They can connect you with support groups or counseling.

Prevention

Not all cases can be prevented, but you can lower your risk by practicing good hygiene, treating infections early, and taking antibiotics before dental or surgical procedures if your doctor advises.

Vaccines

Stay up to date on recommended vaccines, such as the flu shot and pneumonia vaccine, to reduce your risk of infections that can affect the heart.

Screening programmes

If you have a heart condition (like a valve problem), your doctor may recommend regular check-ups and echocardiograms to catch any infection early.

Complications

If left untreated

• Permanent damage to heart valves, leading to heart failure
• Blood clots that can travel to the brain or lungs
• Abscess (collection of pus) in the heart muscle
• Kidney damage from infection or clots

Long-term outlook

With prompt treatment, most people recover fully from heart infection or inflammation. Recovery may take weeks or months, but the outlook is good, especially when you follow your doctor's advice and attend all follow-up appointments.

Find support

International organisations

• World Heart Federation ↗

Local organisations

• British Heart Foundation ↗ · UK

Helplines

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