Heart failure does not usually cause soreness in the legs, and it is possible that the legs of heart failure patients will be sore due to calcium deficiency and lack of exercise. The first adverse symptoms induced by heart failure are easy fatigue, including weakness in the limbs and dyspnea. Next is loss of appetite as well as bloating and discomfort, followed by a rapid heartbeat that can induce arrhythmia. Then there is a weakening of the heart’s ability to contract, leading to a decrease in lung capacity, and finally there is an induced onset of blood circulation disorders in the lower extremities, leading to swelling of the ankles. Legs can be sore in heart failure patients possibly due to calcium deficiency and lack of exercise. When the body lacks calcium, it will promote osteoclasts to release the calcium in the bone into the blood to relatively maintain the normal blood calcium, which will make the minerals in the bone decrease, osteoporosis, and then the leg will have obvious soreness. If you do not exercise for a long time, it will lead to anaerobic respiration in the legs, and after anaerobic respiration, some lactic acid will be produced, and lactic acid accumulates in the legs, thus causing the symptoms of leg soreness. When heart failure patients have leg pain, they should go to the internal medicine department of the regular hospital in time to clarify the cause of the disease, and carry out targeted treatment under the guidance of professional doctors.