The pain in the undershirt that occurs at night when sleeping may be caused by a disorder of the thoracic spine joints. The thoracic spine is not heavily weighted in this position compared to the lumbar spine, so it does not cause protrusion. However, if the patient has been ambulating or hunching over for a long time, it may lead to misalignment of the small joints and pain. The pain may be aggravated after resting by lying down, but the pain will gradually improve after a while, so no special treatment is needed. Because the whole spine is in the most relaxed state when a person is lying down, it will not aggravate the condition. In addition, it is not excluded that the patient’s bed is too soft, because the soft bed has no support for the spine, and the symptoms will be relieved if the hard bed is replaced. In addition, it is necessary to exclude variant angina, and it is recommended that patients with frequent attacks undergo coronary CTA or coronary angiography to identify coronary lesions.