The exact cause of sarcoidosis
is not known. The current working hypothesis is, in genetically susceptible individuals, sarcoidosis is caused through alteration to the immune response after exposure to an environmental, occupational, or infectious agent.
Since sarcoidosis is confused most commonly with neoplastic diseases
, such as lymphoma
, or with disorders characterized also by a mononuclear cell granulomatous inflammatory process, such as the mycobacterial and fungal disorders ,so exhaustive investigations are done for the diagnosis and this includes chest X-ray, CT scan
of chest, PET scan, CT-guided biopsy
, open lung biopsy, bronchoscopy
with biopsy etc.
Consult a good pulmonologist and get investigated properly.