Pulmonary FibrosisPulmonary fibrosis is a progressive condition that causes the thickening, scarring, and stiffening of the lung tissue over time. When this happens, the ability of the lungs to provide oxygen to the rest of the body – and to rid the body of carbon monoxide – is severely impaired. The condition is typically caused by some other illness or infection, and it produces a number of distressing symptoms such as loss of weight, pain in the chest, dry cough, painful muscles and/or joints, fatigue and general weakness, and shortness of breath during exertion. With a physician’s approval, medical marijuana may be incorporated into the treatment program, providing relief from the pain symptoms.