Mitral regurgitation is a heart condition where the mitral valve does not close properly, allowing blood to flow backward from the left ventricle into the left atrium during heart contraction. This can lead to symptoms such as shortness of breath, fatigue, and palpitations, and may result in complications like heart enlargement or heart failure if left untreated. Causes can include valve degeneration, rheumatic Heart disease, or damage from a heart attack. Treatment options range from monitoring to medication and surgical interventions, depending on the severity of the condition.