Sleeping on one’s side with a vague pain in the heart may be caused by the blood supply to the heart is affected, but also may be the lungs, pleura and other parts of the disease and other causes. 1. Blood supply to the heart is affected: Sideways sometimes press part of the blood vessels, affecting the blood supply to the heart, there may be myocardial ischemia, angina and so on, at this time you may feel the heart part of the hidden pain, you can change the sleeping position, if necessary, take nitroglycerin to improve the situation. 2. Lung, pleural lesions: If there are lesions in the lungs, such as lung inflammation, tuberculosis, etc., when you turn sideways, you may pull to the lesion, making it painful. In addition, if the pleura has inflammation and other lesions, the phenomenon will also appear, can be treated with appropriate antibiotics such as penicillin, azithromycin, etc., and tuberculosis can be used anti-tuberculosis drugs such as isoniazid and other drugs. 3. other parts of the lesions: if the chest skin damage or herpes virus infection, the side may stimulate the damaged area caused by pain need to use antiviral drugs such as acyclovir and other drugs, if the skin damage caused by the suggestion of timely use of iodine povidone disinfection to prevent infection. Patients who sleep on their side with a vague pain in the heart are advised to go to the hospital in time, after clarifying the cause of the disease, according to the doctor’s diagnosis of reasonable medication and standardized treatment.