Crystalline silica exposure may cause workers to develop silicosis, an occupational disease. Workers can breathe in these tiny bits of sand, rock and quartz. These mineral substances can become trapped in the lungs and cause scarring. Silicosis may cause the following symptoms: Chronic coughing With acute silicosis, workers may experience fever and sharp chest pain Loss of appetite Discolored, blueish skin or lips Fatigue Shortness of breath or wheezing Fevers caused by funga