Women with pain below the right clavicle at night may be caused by the following reasons: First, it may be caused by excessive fatigue, for example, some women may overuse the right upper limb during the day for related labor, or exercise, which may lead to fatigue of the muscles here, such as the pectoralis major, deltoid and so on, and during the patient’s sleep, it may be due to muscle fatigue. During sleep, the patient may feel pain due to muscle fatigue. Second, it may be caused by poor posture, such as sitting or standing during the day, which may lead to muscle spasm and pain during sleep at night. Third, it may be caused by frozen shoulder on the right side, for example, due to trauma to the right shoulder or frozen shoulder, which may cause pain in the above mentioned area at night.