As the Cleveland Clinic explains, coughing up blood can occur with pneumonia, bronchitis, or tuberculosis. Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the ...

He was admitted Feb. 14 with a bad case of bronchitis that developed into a complex lung infection and double pneumonia. He has long battled respiratory illnesses and had part of one lung removed ...

but often extends into respiratory bronchioles and alveoli with intra-alveolar buds of granulation tissue resulting in bronchiolitis obliterans organizing pneumonia (BOOP). The lung architecture ...