Cardiac symptoms such as dyspnea, chest pain, palpitations, syncope, and cyanosis can arise from various cardiac pathologies. Dyspnea can be exertional, positional (orthopnea), paroxysmal, or acute pulmonary edema due to reduced vital capacity, exaggerated reflexes, lung congestion, edema, fatigue, or compression. Edema results from increased hydrostatic pressure and capillary permeability shifting fluid into tissues. Cyanosis can be central from reduced oxygen-carrying hemoglobin or peripheral from poor circulation. Palpitations reflect changes in heart rate, rhythm, or force and may involve irregular pulse or shortness of breath.