Posibleng Mga Sanhi para sa Paulit-ulit na Pulmonya Small-Cell Carcinoma sa Baga Esophagitis Gastroesophageal Reflux Disease Chronic Alcoholism Hika Sakit na Alzheimer Chronic na Obstructive Pulmonary Disease Atelectasis Congestive Heart Failure Chronic Kidney Insufficiency Non-Hodgkin Lymphoma Chronic na Bronchitis Demensiya Rheumatoid Arthritis Paulit-ulit na Pulmonary Embolism Pulmonary Infarction Bronchogenic Carcinoma Pabalik-balik na Small-Cell Carcinoma sa Baga Bronchial Adenocarcinoma Unresolved Pneumonia Diaphragmatic Hernia Pulmonary Metastasis Leukemia Pulmonary Fibrosis Primary Immune Deficiency Disorder Myelodysplasia Multiple Myeloma Cystic Fibrosis Granulomatosis na may Polyangiitis Sjögren Syndrome