Chronic beryllium disease (CBD) is a lung disease caused by exposure to beryllium, a metal found in some industrial workplaces. It is an occupational lung disease that can cause severe scarring of the lungs, leading to difficulty breathing and other respiratory problems. Symptoms of CBD include shortness of breath, chest tightness, fatigue, and a dry cough. People with CBD may also experience weight loss, fever, and night sweats. Treatment for CBD includes avoiding further exposure to beryllium, taking medications to reduce inflammation, and using oxygen therapy.