The pain in this position may of course be due to compression pain caused by wearing an inappropriate bra. It may also be due to long-term fixed posture, excessive tension and strain of the shoulder and back muscles leading to dorsal fasciitis or cervical spondylosis. However, the pain caused by the above diseases can be relieved after activity or massage. If the pain is aggravated by activity or occurs even at rest, or is accompanied by panic, fatigue, or sweating, then it is necessary to be alert to coronary angina pectoris, which can be clarified by an electrocardiogram (ECG) with the local medical institution.