Heart failure symptoms commonly include palpitations, shortness of breath (dyspnea), and edema.  Left heart failure manifests as lung congestion, with shortness of breath worsening from exertion to rest in advanced stages.  Right heart failure shows systemic congestion: jugular venous distention, edema (often pitting and in lower extremities), weight gain, and hepatomegaly;  severe cases can cause anorexia and abdominal fullness.  Reduced cardiac output leads to fatigue, poor concentration, memory problems, and altered consciousness.