This document discusses common cardiovascular and respiratory symptoms. It defines symptoms as subjective feelings reported by patients and signs as objective observations made by doctors. Common cardiovascular symptoms include dyspnea, paroxysmal nocturnal dyspnea, orthopnea, chest pain, palpitations, syncope, and cyanosis. Dyspnea, or breathlessness, is the most common and can be caused by conditions like heart failure, lung diseases, or anemia. Other symptoms like chest pain, palpitations, and syncope are discussed along with their potential causes. Common respiratory symptoms include cough, sneezing, sore throat, nasal discharge, and hoarseness of voice.