Underlying Causes
Rheumatic fever is caused by an autoimmune reaction to an infection with Group A Streptococcus bacteria, such as strep throat or scarlet fever. The condition is not an infection itself but rather the result of the body's immune system becoming overactive. In an attempt to fight the bacteria, the immune system mistakenly targets healthy tissues in the heart, joints, skin, and nervous system because these tissues contain proteins similar to those found in the strep bacteria. This phenomenon is often referred to as molecular mimicry.

Risk Factors and Triggers
Several factors increase the likelihood of developing this condition after a strep infection. Environmental factors play a significant role, particularly overcrowding and poor sanitation, which facilitate the rapid spread of strep bacteria. Genetics also appear to influence susceptibility, as some families may be more prone to the specific immune response that triggers the fever. The condition is most common in school-aged children, likely due to frequent exposure to germs in group settings.

Primary Prevention
The most effective way to prevent rheumatic fever is the prompt and complete treatment of strep throat and scarlet fever with appropriate antibiotics. Treating the bacterial infection within nine days of the onset of symptoms significantly reduces the risk of the autoimmune reaction. Parents should seek medical attention for children with persistent sore throats, especially if accompanied by fever, headache, or swollen lymph nodes.

Preventing Recurrence
Individuals who have already had an episode of rheumatic fever are at high risk for recurrence if they contract strep again. Secondary prevention involves taking low-dose antibiotics continuously, often for many years or until adulthood, to prevent future strep infections. This strategy is crucial because repeated attacks increase the risk and severity of permanent heart damage.

Common Signs and Symptoms
Symptoms of rheumatic fever usually appear two to four weeks after a strep throat infection. The signs can vary greatly depending on which parts of the body are inflamed. The most common symptom is arthritis, which presents as pain, swelling, redness, and warmth in major joints like the knees, ankles, elbows, and wrists. This joint pain often migrates, moving from one joint to another. Other symptoms include fever, fatigue, and specific skin issues like painless nodules under the skin or a rash with ragged edges known as erythema marginatum. If the central nervous system is affected, a condition called Sydenham's chorea may occur, characterized by jerky, uncontrollable body movements and emotional changes.

Cardiac Symptoms
Inflammation of the heart, or carditis, is the most serious manifestation and may not always cause immediate noticeable symptoms. When symptoms are present, they can include chest pain, shortness of breath, and a rapid or irregular heartbeat. In some cases, heart murmurs detected during a physical exam are the only sign of heart involvement. Severe carditis can lead to fluid accumulation and signs of heart failure.

Diagnostic Process
Doctors use a set of guidelines known as the Jones Criteria to diagnose rheumatic fever. A diagnosis typically requires evidence of a recent strep infection (such as a positive throat culture or elevated antibody test) combined with either two major signs (like carditis or arthritis) or one major and two minor signs (like fever or high inflammatory markers in blood tests). Tests used to confirm the diagnosis and assess severity include blood tests to check for inflammation (ESR and CRP), electrocardiograms (ECG) to look for irregular heart rhythms, and echocardiograms to visualize heart valves and check for inflammation or damage.

Differential Diagnosis
Clinicians must distinguish rheumatic fever from other conditions that cause joint pain and fever. These can include juvenile idiopathic arthritis, Lyme disease, septic arthritis, and reactive arthritis. The clear link to a preceding strep infection is a key factor that helps differentiate rheumatic fever from these other disorders.

Medications and Medical Management
The primary goals of treatment are to eliminate any remaining strep bacteria, relieve symptoms, and control inflammation. Doctors typically prescribe antibiotics, such as penicillin, to clear the infection. Anti-inflammatory medications, such as aspirin or naproxen, are used to reduce fever, pain, and swelling in the joints. In cases where the heart is severely affected, corticosteroids may be prescribed to reduce cardiac inflammation. For patients experiencing involuntary movements due to Sydenham's chorea, anticonvulsant medications are occasionally used to manage severe symptoms, although this is often self-limiting.

Long-Term Management and Prophylaxis
After the acute phase resolves, the focus shifts to preventing recurrence. Patients are typically placed on a regimen of preventative antibiotics, which may be taken daily orally or as a monthly injection. The duration of this preventive treatment varies based on the severity of the initial attack and whether heart damage occurred, ranging from five years to lifelong prophylaxis. Regular follow-up appointments with a cardiologist are essential for monitoring heart valve health, usually involving periodic echocardiograms.

Lifestyle and Self-Care
During the acute phase of the illness, bed rest is strictly recommended to reduce the workload on the heart and allow the body to heal, especially if carditis is present. As recovery progresses, activity levels are gradually increased under medical supervision. Good dental hygiene is also emphasized to prevent bacterial endocarditis, a heart infection that damaged valves are more susceptible to.

When to Seek Medical Care
It is vital to see a doctor if a child develops a sudden sore throat, especially without cold symptoms like a runny nose, or if they have a fever and swollen glands. Seek emergency care or immediate medical attention if symptoms of heart failure appear, such as severe shortness of breath, chest pain, or rapid heartbeat. Routine follow-up is critical for anyone with a history of rheumatic fever to ensure the antibiotic regimen is working and to monitor for potential heart complications.

Severity and Disease Course
Rheumatic fever typically lasts for a few weeks to several months. The severity of the illness varies significantly from person to person. While the joint pain and fever usually resolve without permanent effects, the involvement of the heart determines the seriousness of the condition. Mild cases may involve only transient joint pain, while severe cases can cause intense inflammation of the heart muscle and valves, leading to acute heart failure. The acute symptoms generally subside with treatment, but the structural damage to the heart can persist.

Long-Term Complications
The most significant long-term risk is rheumatic heart disease, which involves permanent scarring and deformation of the heart valves, most commonly the mitral and aortic valves. This damage can disrupt blood flow, leading to leakage (regurgitation) or narrowing (stenosis) of the valves. Over time, this can strain the heart and lead to chronic heart failure, atrial fibrillation, and an increased risk of stroke. Patients with damaged heart valves are also at higher risk for infective endocarditis later in life.

Prognosis and Life Expectancy
The prognosis depends heavily on whether the heart was affected during the initial attack and whether recurrence is prevented. If no heart damage occurs during the acute illness, the prognosis is excellent, and full recovery is expected. If heart valves are damaged, the outlook varies; some people live normal lives with mild valve issues, while others may eventually require heart valve repair or replacement surgery. Consistent adherence to antibiotic prophylaxis is the single most important factor in preventing recurrence and worsening of the prognosis. With modern medical care and prevention strategies, mortality rates from the acute phase are very low in developed regions.

Impact on Activities and School
During the active phase of rheumatic fever, children often need to stay home from school and limit physical activity to ensure recovery, particularly if the heart is involved. This period of restricted activity can be frustrating and isolating. Once the acute inflammation has resolved, most children can return to normal activities. However, those with significant heart valve damage may need to avoid certain strenuous competitive sports or heavy physical exertion. Parents and teachers should coordinate to ensure the child stays caught up with schoolwork during the recovery period.

Emotional and Social Aspects
Living with a chronic risk of recurrence or heart disease can be anxiety-inducing for both children and parents. The requirement for regular antibiotic injections or daily pills can be burdensome and painful, sometimes leading to resistance or non-compliance in children. Sydenham's chorea, which causes uncontrollable movements and emotional instability, can be particularly distressing and socially embarrassing for a child until it resolves. Supportive care and understanding from family and peers are crucial during these times.

Questions to Ask Your Healthcare Provider
Preparing a list of questions can help patients and caregivers manage the condition effectively. Consider asking the following:

• How long will my child need to take preventative antibiotics?
• Are there any restrictions on sports or physical activities?
• What specific signs of recurrence should I watch for?
• How often do we need to schedule follow-up appointments or echocardiograms?
• Does this condition require special precautions during dental procedures?
• What should I do if a dose of the antibiotic is missed?

Q: Is rheumatic fever contagious?
A: Rheumatic fever itself is not contagious. However, the strep bacteria that trigger the condition are contagious and can spread through respiratory droplets from coughing or sneezing. This is why treating the underlying strep infection is critical.

Q: Can adults get rheumatic fever?
A: While it is much more common in children aged 5 to 15, adults can get rheumatic fever, though it is rare. Adults who had the condition as children may continue to deal with the long-term effects, such as rheumatic heart disease.

Q: Does joint pain from rheumatic fever cause permanent damage?
A: Typically, no. The arthritis associated with rheumatic fever can be very painful and cause significant swelling, but it usually resolves completely without causing permanent damage to the joints.

Q: Why do I have to take antibiotics if I feel fine?
A: Continued antibiotics are necessary to prevent a new strep infection. Because the immune system is already primed to react abnormally, a new infection could trigger another attack of rheumatic fever, increasing the risk of severe and permanent heart damage.

Q: Can rheumatic heart disease be fixed?
A: Heart valve damage cannot always be reversed, but it can be managed. Mild cases are monitored, while severe valve damage may eventually require surgical repair or replacement to restore proper heart function.