The symptoms of weak heart muscles include shortness of breath, excessive fatigue, dizziness, chest pain and weight gain, according to Healthline. Weak heart muscles can also manifest in leg and feet edema, sleeping difficulty and congestion triggered by fluid-filled lungs. An individual with these symptoms should immediately consult a doctor.
Weakened heart muscles result from the enlargement and dilation of the left ventricle as a result of conditions such as coronary artery disease or heart attack, explains Healthline. These conditions cause constriction in the arteries, preventing the blood flow to some parts of the heart. When this happens, the cardiac muscles become weak, thus the heart becomes unable to pump blood around the body effectively, resulting in serious conditions, such as heart failure.