LDL 5.31mmol/L is not a heart disease, the normal range of LDL is 2.07-3.1mmol/L, and the patient’s LDL 5.31mmol/L is far more than the standard value, which is a manifestation of hypercholesterolemia. When the patient’s LDL is high, it is easy to form atherosclerotic plaques in the patient’s blood vessel wall, blocking the patient’s blood vessels, which can easily lead to coronary heart disease, cerebral infarction and other diseases. Patients can adjust their diet and living habits, avoid excessive greasy, high salt and spicy food, and participate in appropriate physical exercise to enhance physical fitness. If patients have medical needs, please be sure to go to a regular medical institution, clarify the cause of the disease, and actively cooperate with the doctor’s professional treatment, so as not to delay the condition.