Relapses occur in about 50 percent of cases, usually within three to six months after the steroid treatment has been stopped. If the condition becomes chronic, drug therapy may last for several years. Respiratory failure due to scarring in the lungs is the most common cause of death. Bleeding in the lungs due to infection is the next most common cause. If the condition forms in or close to the heart, it can cause heart failure or potentially fatal irregularities of the heartbeat.
Sarcoidosis can also cause high levels of calcium to accumulate in the blood and urine.
If left untreated, the excess calcium can cause kidney stones, and eventually kidney failure. Although sarcoidosis often affects the liver, it rarely leads to significant liver problems or jaundice. Mild cases are usually better left untreated. The doctor will resort to steroids only if the condition threatens serious damage. If steroids or other medications are prescribed, be sure to take them exactly as directed, even if you feel well and the symptoms subside.