HBSAg may affect your lungs in following ways. 1. Infection in immunocompromised. 2. Hepatopulmonary syndrome
. 3. Portopulmonary hypertension
. Though infection may occur anytime, the other 2 syndromes may occur over long term. Observe for the following ill health - breathlessness on exertion, fainting/syncope episodes, worsening of jaundice
along with Cough.