Sarcoidosis: Symptoms, Diagnosis and Treatment

What is sarcoidosis?

Granulomas are organized clusters of inflammatory cells. In sarcoidosis they can occur in several parts of the body, especially the lungs and lymph nodes within the chest. Inflammation may settle, persist or, in some people, lead to scarring. The exact cause is not fully understood. [1]

Sarcoidosis is not a cancer and does not spread from person to person. However, other illnesses may produce similar symptoms, enlarged lymph nodes or granulomas. The diagnosis therefore requires more than recognizing a familiar scan pattern. [2], [3]

Which symptoms can occur?

• Persistent dry cough, breathlessness or chest discomfort.
• Fatigue that affects work, exercise and daily tasks.
• Tender skin lumps, other skin changes or swollen joints.
• Eye redness, pain, light sensitivity or blurred vision.
• Palpitations, fainting or other symptoms when the heart is involved.

Some people have no symptoms and the condition is found on imaging performed for another reason. Symptoms outside the lungs matter: tell the clinician about changes in vision, skin, joints, heartbeat and concentration as well as breathing. [4]

A persistent cough has many possible causes. Neither cough nor fatigue alone establishes sarcoidosis. A consultation should consider the full pattern rather than selecting a diagnosis from one symptom.

How is sarcoidosis diagnosed?

Assessment combines your history, examination, chest imaging and, when needed, a tissue sample. Chest X-ray or CT may show enlarged chest lymph nodes, small lung nodules or scarring. The appearance helps guide further investigation but is not always conclusive. [5]

A biopsy may be taken from an accessible skin lesion or lymph node, or through bronchoscopy. When chest lymph nodes need sampling, endobronchial ultrasound (EBUS) may be appropriate. Not everyone needs a biopsy; the benefits, alternatives and follow-up plan should be discussed. [3], [6]

A blood test such as serum ACE cannot confirm or exclude sarcoidosis on its own. A raised result is not a reason to begin treatment without appropriate assessment. [6]

Looking beyond the chest X-ray

The exact tests depend on the clinical findings. Palpitations or fainting may lead to further heart assessment; neurological symptoms need their own evaluation. A normal lung-function result does not rule out disease in another organ. [3], [5]

Our guides explain complete pulmonary function tests and DLCO gas-transfer testing. Results are most useful when compared with previous measurements and interpreted alongside symptoms and imaging.

When is treatment needed?

Observation is an active plan, not an absence of care. If organ function is preserved and symptoms are limited, regular follow-up may be appropriate because sarcoidosis can improve without medicines. Treatment becomes more important when inflammation threatens an organ, lung function declines or symptoms substantially affect quality of life. [1], [6]

Corticosteroids such as prednisolone are commonly used to reduce inflammation. Methotrexate and other medicines may be considered to reduce steroid exposure or as an alternative in selected patients. The best approach depends on the organs involved, how quickly treatment is needed, other conditions and patient preferences. [7]

A 2025 randomized trial also studied methotrexate as initial treatment for pulmonary sarcoidosis. This supports discussing current options with a specialist; it does not mean everyone should switch treatment or that one medicine suits every form of sarcoidosis. [9]

Treatment needs safety checks. Steroids can affect weight, mood, blood pressure, glucose, bones and eyes. Immune-suppressing medicines can increase infection risk and may require regular blood tests. Do not start, stop or change these medicines without a clear plan from your treating team. [7]

Monitoring, fatigue and day-to-day care

Follow-up may include symptoms, lung-function trends, selected imaging and blood tests. Even after improvement, recurrence is possible. Agree when your next review is due and which new symptoms should trigger earlier contact. [8]

Chest X-ray stages describe patterns of chest involvement; they are not cancer stages and do not mean that everyone progresses through them in order. Decisions should reflect current symptoms and organ function, not a stage label alone. [5], [6]

Fatigue deserves attention even when a scan looks stable. Discuss sleep, activity, mood and other possible contributors. A paced return to activity, smoking cessation, adequate rest and support can be part of your plan. Pulmonary rehabilitation may help selected people with ongoing limitations. [7], [8]

Ask before taking calcium or vitamin D supplements, including high-dose injections. Sarcoidosis can affect calcium regulation, so routine supplementation without checking may be inappropriate. Bone protection during steroid treatment should be individualized. [2]

For persistent lung involvement, the clinic's ILD and pulmonary fibrosis assessment service can support respiratory evaluation. Breathlessness that seems out of proportion to lung findings may also require assessment for pulmonary hypertension or cardiac involvement. [6]

Symptoms that should not wait

If you take immune-suppressing treatment and develop fever or feel acutely unwell, contact your care team promptly. A new infection may need different treatment from a sarcoidosis flare.

Preparing for a respiratory consultation

• Bring previous chest X-rays or CT images as well as the written reports.
• Include biopsy and microbiology results, particularly any TB investigations.
• Bring lung-function trends and a complete medicine and supplement list.
• Write down changes in breathing, exercise tolerance, vision, skin and heartbeat.

Useful questions include: How certain is the diagnosis? Which organs are involved? What would trigger treatment? How will benefit and side effects be monitored?