Endocarditis is infection-related inflammation of the inner lining of the heart, especially the valves. Bacteria are responsible in most cases, and if the condition is not recognized early it can lead to valve damage, emboli, and life-threatening complications. ^[1][3][4]

Symptoms may develop over a few days or more subtly over several weeks. Prolonged fever, night sweats, fatigue, a new or changing heart murmur, shortness of breath, and unexplained weight loss should raise suspicion for endocarditis in the right clinical setting. ^[1][2][4]

What is endocarditis?

Endocarditis is infection of the endocardium, the tissue that lines the inside of the heart. The most common site of involvement is the heart valves, which is why it is also known as a “valve infection.” Microorganisms can enter the bloodstream and attach to a damaged valve surface, a prosthetic valve, or some congenital heart abnormalities. Infected clusters called vegetations form there. The problem is not only the presence of infection; these clusters can disrupt valve structure, send clot-like fragments into the bloodstream, and damage organs. ^[1][3][4]

Endocarditis is uncommon but highly serious. If diagnosis is delayed, heart failure, stroke, kidney damage, and systemic emboli can develop. For that reason, in a person with prolonged unexplained fever—especially someone with risk factors—the possibility of endocarditis must always be considered. ^[1][3][4]

What are the symptoms?

Symptoms do not follow a single pattern. Fever and chills are the most common complaints; these may be accompanied by fatigue, night sweats, loss of appetite, weight loss, muscle and joint pain, and shortness of breath. Some people may mainly have chest pain, cough, or back pain. On examination, a newly developed or changed heart murmur may be heard. In more advanced situations, small vascular skin lesions, painful or painless rash-like findings on the palms or soles, and embolic symptoms can appear. ^[1][2][3]

One of the biggest problems is that symptoms can be subtle. Especially in people with underlying valve disease, weeks of low-grade fever and fatigue may be mistaken for a simple infection. But lost time in endocarditis can increase valve damage. If neurologic symptoms, sudden arm or leg pain, blood in the urine, increasing shortness of breath, or altered consciousness appear, complications should be suspected. ^[1][3][4]

Who is at higher risk?

Risk factors include a prosthetic heart valve, previous endocarditis, some congenital heart diseases, significant valve disease, certain devices placed in the heart, and intravenous drug use. Long-term intravenous catheters and some invasive procedures can also create an opportunity for bacteria to enter the bloodstream. Poor oral hygiene does not cause endocarditis in every person, but maintaining good oral and dental health is important in those at higher risk. ^[1][3][4]

How is it diagnosed?

Clinical suspicion, blood cultures, and echocardiography are the foundations of diagnosis. Blood cultures help identify which microorganism is responsible and guide the choice of the right antibiotic. Transthoracic or transesophageal echocardiography can evaluate vegetations, valve damage, and abscesses. Diagnosis is usually made not with a single test, but by combining fever history, physical examination, laboratory findings, imaging, and culture results. ^[1][2][4]

In people with suspected endocarditis, fever that comes and goes, a short-lived improvement after starting antibiotics, or what appears to be another source of infection do not rule the disease out. Especially in high-risk patients, repeated cultures, repeat echocardiography, and specialist evaluation may be necessary. The fact that the diagnosis is not fully established within a few days does not mean the illness is unimportant. ^[1][2][4]

How is it treated?

Treatment of endocarditis usually requires intravenous antibiotics for weeks. The length of treatment and the choice of drug depend on the organism involved, which valve is affected, whether prosthetic material is present, and whether complications have developed. In some people, even if the infection is brought under control, surgery may be needed because the valve has been severely damaged. For this reason, treatment is a multidisciplinary process that involves not only infectious diseases specialists, but also cardiology and cardiac surgery. ^[1][2][3]

Self-treating with antibiotics or stopping treatment early just because symptoms improve carries serious risks. In addition, in some cases of culture-negative endocarditis, identifying the causative organism can be more difficult and further evaluation may be needed. Follow-up in appropriate centers is important both for controlling the infection and for assessing valve function. ^[2][4]

What are the complications?

Endocarditis can lead to valve insufficiency, heart failure, embolic strokes, kidney damage, and infarctions in the spleen or other organs. If the infection is not controlled, it can progress to sepsis. For that reason, in a high-risk patient with prolonged fever, a “let’s wait a little longer” approach is not safe. A large part of permanent damage is related to delays in diagnosis and treatment. ^[1][3][4]

Prevention and when to see a doctor

Some cases of endocarditis are linked to dental procedures, but not every case develops after dental treatment and often no clear trigger can be identified. For that reason, prevention should not be reduced only to the question of antibiotics before procedures. Regular dental care, appropriate treatment of skin infections, hygiene during intravenous procedures, and regular follow-up of existing heart disease should all be considered together. It is especially important that people with prosthetic valves or a history of endocarditis understand this risk. ^[1][3][4]

One of the most important preventive points is good oral and dental health. However, antibiotic prophylaxis is not routine for everyone; it is considered only in certain high-risk groups and before certain procedures. That is why the question “Should I take antibiotics before dental treatment?” requires an individualized cardiology assessment. If there is prolonged fever, chills, night sweats, new shortness of breath, or unexplained fatigue, medical evaluation should not be delayed—especially in people at risk. ^[1][3][4]

Sudden neurologic symptoms, chest pain, serious shortness of breath, fainting, or rapid worsening require emergency help. In summary, endocarditis is a rare but high-risk heart infection, and thinking of it at the right time can significantly affect outcomes. ^[1][2][3]

FAQ

Is endocarditis contagious?

It is generally not considered a disease that spreads directly from person to person; in most cases bacteria enter the bloodstream from the person’s own body and then reach the heart. ^[1][3]

Can prolonged fever be a sign of endocarditis?

Yes. Especially in people with risk factors, unexplained fever lasting for weeks should be evaluated for endocarditis. ^[1][2]

How long does treatment last?

Most patients require intravenous antibiotic treatment lasting for weeks. ^[2][4]

Why does dental health matter?

Bacteria that enter the bloodstream from the mouth can contribute to endocarditis in some high-risk people, so oral hygiene is important. ^[1][3]

When should someone go to the emergency department?

Emergency evaluation is needed if there are new neurologic symptoms, severe shortness of breath, chest pain, fainting, or rapidly worsening general condition. ^[1][3]