Pulmonary embolism is a severe, life-threatening blockage of the pulmonary artery caused by foreign matters like blood clots, tumors, air or fat. Most at risk are people suffering from heart disease, COPD, cancer, paralyses, sickle cell disease, and those who underwent surgery and had extended bed rest. Sarcoidosis is a rare disease that occurs due to inflammation. Sarcoidosis is characterized by granulomas — small lumps, that usually disappear on their own. Those that do not heal and disappear can cause scarring of the inflamed tissue. Here, you can talk about causes, diagnosis, and treatment, of both diseases.