A recurrent hemorrhage occurring within the lung.

Anemia caused by low iron intake, inefficient iron absorption in the gastrointestinal tract, or chronic blood loss.

Coughing up (expectoration) of blood or blood-streaked sputum from the larynx, trachea, bronchi, or lungs.

Replacement of normal lung tissues by fibroblasts and collagen.

Impairment of gas exchange within the lungs secondary to a disease process, neoplasm, or trauma, possibly resulting in hypoxia, hypercarbia, or both, but not requiring intubation or mechanical ventilation. Patients are normally managed with pharmaceutical therapy, supplemental oxygen, or both.

An abnormality of the respiratory system, which include the airways, lungs, and the respiratory muscles.

Decreased levels of immunoglobulin A (IgA).