Sarcoidosis
An inflammatory disease in which small clusters of immune cells (granulomas) form in the body, most often the lungs and lymph nodes. Many cases are mild and settle on their own, but it can affect other organs and cause a persistent cough, breathlessness, fatigue and raised calcium.
What it is
Sarcoidosis is an inflammatory condition in which the immune system forms tiny clumps of cells, called granulomas, in one or more organs. The cause is not fully known — it is thought to involve an over-reaction of the immune system, possibly to an environmental trigger, in genetically susceptible people. It most commonly affects the lungs and the lymph nodes in the chest, but can involve the skin, eyes, joints, heart, nervous system and other organs, which is why its picture varies so widely. Many people have mild disease that causes few or no symptoms and gets better on its own over months to a couple of years. Others have more persistent or serious disease. Common features include a dry cough, breathlessness, chest discomfort, tiredness, fever, joint pains, and skin or eye changes. Because granulomas can produce extra active vitamin D, sarcoidosis can raise blood calcium. It is diagnosed by putting together the clinical picture, imaging (chest X-ray or CT), and usually a tissue biopsy showing the granulomas, while excluding look-alike conditions such as infection. Blood tests, including ACE and calcium, support assessment and monitoring but do not by themselves make or exclude the diagnosis. Treatment is not always needed; when it is, corticosteroids and other immune-modulating drugs are used.
Key lab markers
- ACE (angiotensin-converting enzyme) — often raised in active disease; supportive, not diagnostic (a normal level does not exclude it).
- Calcium — can be raised, as granulomas make extra active vitamin D; important to check.
- CRP and ESR — inflammatory markers, often raised with active disease.
- Imaging and biopsy — chest X-ray or CT and a tissue sample showing granulomas are central to diagnosis.
- Liver and kidney function — assess involvement of other organs.
Symptoms
- A dry cough and breathlessness
- Chest discomfort
- Tiredness and a general feeling of being unwell
- Fever, night sweats and weight loss
- Painful, swollen joints
- Tender red lumps on the shins, or other skin changes
- Red, painful eyes
- Often, few or no symptoms (found incidentally)
Related lab panels
When to discuss with a doctor
Sarcoidosis is worth considering with a persistent dry cough and breathlessness, unexplained fatigue, red tender lumps on the shins, or red painful eyes, especially with abnormal findings on a chest X-ray. Because it can affect many organs, some situations need prompt care: red painful eyes with visual changes, an irregular or slow heartbeat or blackouts (possible heart involvement), or symptoms of a high calcium (excessive thirst, confusion). Many cases are mild and simply monitored, but a specialist assessment establishes the diagnosis and decides whether treatment is needed. Mediora.AI can highlight a supportive pattern — a raised ACE, calcium, or inflammatory markers — but sarcoidosis is diagnosed with imaging and biopsy and managed by your doctor and specialist.