I have silicosis but arecent xray could not show it what does this mean i have 10 plus years of being exposed in coal mining

See answer: Silicosis is an occupational respiratory disease that may appear clinically up to years after someone's exposure to crystalline silica. As the disease progresses, symptoms may include: shortness of breath, severe cough, weakness and possibly progress to respiratory distress. The diagnosis is usually made by patient history of exposure, clinical examination, chest xray and pulmonary function stud.