The mitral valve refers to an important passageway between the atrium and the ventricle in the left heart system. This passageway is unidirectional. When the blood from the ventricle can flow back to the atrium through the mitral valve, it indicates mitral valve regurgitation. Mild to moderate mitral valve regurgitation often has no symptoms, and drinking coffee is permissible. However, patients with severe mitral valve regurgitation may experience severe palpitations, chest tightness, and shortness of breath. Drinking coffee can cause arrhythmias, palpitations, chest tightness, and increased heart workload; therefore, it is advised that such patients should not consume coffee.