Because sarcoidosis has been noted to occur in family groups, a genetic cause has also been suggested. Research shows that identical twins are more likely to both have sarcoidosis than are nonidentical twins or other siblings. Some cases of sarcoidosis occur without the patient even noting any symptoms. These cases are often discovered by chance during routine chest x rays . Most cases of sarcoidosis, however, begin with very nonspecific symptoms, such as decreased energy, weakness, and a dry cough .
Some patients note that they are having unusual shortness of breath while exercising.
Some patients develop fever , decreased appetite, and weight loss. The eyes may become red and teary, and the vision blurry. Lymph nodes in the neck, armpits, and groin become enlarged and tender. Lymph nodes within the chest, around the lungs, also become enlarged. Nasal stuffiness is common, as well as a hoarse sound to the voice.