Question: why pneumonia keeps coming back?
Answer: The following systemic or immune-mediated diseases may cause recurrent pneumonia: hypersensitivity pneumonitis, collagen vascular disease, renal-pulmonary syndromes (e.g. Wegener's granulomatosis, Goodpasture's syndrome, microsopic poly-angiitis, Churg-Strauss syndrome), allergic bronchopulmonary aspergillosis (or ...