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Overview

What Is Sarcoidosis?

Sarcoidosis is an inflammatory condition in which clusters of immune cells, called granulomas, form in one or more organs. The lungs and nearby lymph nodes are most commonly affected, but sarcoidosis can also involve the skin, eyes, heart, nerves, and other organs. Symptoms and severity vary widely, and some people have no noticeable symptoms. The condition can affect people of different ages and backgrounds.

Symptoms

Sarcoidosis Symptoms

Some people with sarcoidosis have no symptoms and are diagnosed after an incidental finding on a chest X-ray or other imaging. When symptoms occur, they depend on which organs are affected and how active the inflammation is.

  • Lung: Shortness of breath may occur when inflammation affects lung tissue.
  • Lung: A persistent cough can be a sign of pulmonary sarcoidosis.
  • Lung: Chest discomfort may occur with lung or lymph-node involvement.
  • General: Fatigue can continue even when other symptoms are mild.
  • General: Fever may occur during active inflammation.
  • General: Swollen lymph nodes (lymphadenopathy) may be found in the chest or other areas.
  • Skin: Raised skin bumps or plaques may develop on different parts of the body.
  • Skin: Tender red lumps on the shins (erythema nodosum) can occur.
  • Eyes: Eye pain or redness may result from eye inflammation.
  • Eyes: Blurred vision may occur when sarcoidosis affects the eyes.
  • Heart: Palpitations may be caused by abnormal heart rhythms.
  • Heart: Fainting can occur with certain heart rhythm problems.
  • Nervous system: Numbness or weakness may indicate nerve involvement.

SEEK PROMPT CARE

Symptoms that need urgent evaluation

Seek prompt medical attention for sudden vision changes, severe breathing difficulty, fainting, chest pain, or new weakness or numbness. These symptoms can signal serious involvement of the eyes, lungs, heart, or nervous system.

Causes

Sarcoidosis Causes

Sarcoidosis develops when the immune system mounts an exaggerated inflammatory response and forms granulomas in affected tissues. However, no single cause of sarcoidosis has been established, and the condition is probably influenced by a combination of inherited susceptibility and outside triggers.

  • Inherited susceptibility may make some people more likely to develop an unusual immune response.
  • Exposure to environmental or occupational substances, including dusts or chemicals, has been proposed as a possible contributor.
  • Immune responses to infections or other triggers may help start granuloma formation in susceptible people.
  • Sarcoidosis is not known to spread from person to person and is not cancer.

Risk Factors

Sarcoidosis Risk Factors

NON-MODIFIABLE FACTORS

Age, family history, sex, and ancestry or geographic background may be associated with the likelihood of developing sarcoidosis. These patterns describe associations and do not predict who will develop the condition.

POSSIBLE EXPOSURES

Environmental or workplace dusts, chemicals, and other inhaled irritants may be associated with sarcoidosis in some studies. The evidence varies, and an association does not prove that an exposure causes the disease.

Having a risk factor does not mean someone will develop sarcoidosis, and many people with the condition have no identifiable risk factor. A clinician considers the overall medical history rather than relying on one suspected association.

Complications

Sarcoidosis Complications

  • Pulmonary fibrosis can cause permanent lung scarring and reduced breathing capacity.
  • Pulmonary hypertension can develop when blood flow through the lungs becomes difficult.
  • Eye inflammation can lead to vision loss if it is severe or untreated.
  • Abnormal heart rhythms or heart failure can occur when sarcoidosis affects the heart.
  • Kidney stones or kidney dysfunction may result from calcium changes related to sarcoidosis.
  • Nerve damage can cause weakness, numbness, pain, or other neurologic problems.
  • Persistent fatigue can reduce daily functioning and quality of life.

MONITORING MATTERS

Complications are not inevitable

The risk of complications depends on which organs are involved and how active or persistent the inflammation is. Regular follow-up can help identify organ damage early, including problems that may cause few symptoms at first.

Diagnosis

How Sarcoidosis Is Diagnosed

There is no single test that confirms every case of sarcoidosis. Diagnosis is based on the overall clinical picture and may require ruling out tuberculosis, fungal infections, cancer, and other conditions that can cause granulomas.

  • A medical history and physical examination help identify symptoms and signs of organ involvement.
  • A chest X-ray or CT scan can show enlarged lymph nodes or changes in the lungs.
  • Lung-function testing measures how well the lungs move air and transfer oxygen.
  • Blood and urine tests can assess inflammation, calcium levels, kidney function, and other relevant findings.
  • Eye or heart evaluation may be recommended when symptoms, examination findings, or test results suggest involvement.
  • A biopsy of an accessible affected area may identify noncaseating granulomas and help exclude other causes.

Treatment & Management

Sarcoidosis Treatment and Management

Sarcoidosis treatment depends on symptoms, the organs involved, the risk of permanent damage, and whether the disease is improving or worsening. Some people need observation alone, while others need treatment to control inflammation and protect affected organs.

  • Observation with scheduled monitoring may be appropriate for mild, stable disease that is not threatening organ function.
  • Corticosteroids are a common first-line anti-inflammatory treatment when symptoms or organ involvement require therapy.
  • Steroid-sparing medicines such as methotrexate or other immunosuppressants may be used when longer treatment is needed.
  • Targeted treatment may be provided for affected organs such as the eyes, skin, heart, or nerves.
  • Supportive care, including pulmonary rehabilitation or oxygen, may help people with lasting lung problems when appropriate.

TREATMENT SAFETY

Treatment should be individualized

There is no guaranteed instant cure for sarcoidosis, and internet testimonials should not replace specialist-guided care. Ask a clinician about medication monitoring, infection risk, and steroid side effects before changing or stopping treatment.

Outlook and Prognosis

Sarcoidosis Outlook and Prognosis

Sarcoidosis may resolve on its own, remain stable, relapse, or become chronic. Many people have a favorable outlook, while persistent disease affecting the lungs, heart, eyes, or nervous system can cause lasting complications.

  • The organs involved are an important factor in long-term outlook.
  • The severity and duration of inflammation can influence the risk of lasting organ damage.
  • The response to treatment helps clinicians assess whether the disease is coming under control.
  • Pulmonary fibrosis is associated with more persistent lung disease and breathing problems.
  • Regular follow-up supports early detection of relapse or new organ involvement.

When Should You See a Doctor

When Should You See a Doctor for Sarcoidosis?

  • Arrange medical evaluation for a persistent cough or shortness of breath.
  • Unexplained fatigue or weight loss should be discussed with a clinician.
  • New skin lesions or persistent skin changes warrant an assessment.
  • Painful or blurred vision should be evaluated promptly.
  • Palpitations or fainting require medical assessment, particularly in someone with known sarcoidosis.
  • Numbness or weakness may indicate nervous-system involvement and should be checked.
  • Symptoms that worsen during known sarcoidosis should be reported to the treating clinician.

GET MEDICAL HELP

Do not ignore new or worsening symptoms

Seek urgent care for severe breathing difficulty, chest pain, fainting, sudden vision loss, or sudden neurologic symptoms such as new weakness or trouble speaking. If you have been diagnosed with sarcoidosis, follow your clinician’s monitoring plan and report new or worsening symptoms promptly.

Branches

2 topics

Symptoms

2 topics

  • Sarcoidosis

    Cough

  • Sarcoidosis

    Fever