The main reasons for this are the following: 1. It may be due to hormonal changes in the body during menstruation, resulting in endocrine disruption and thus breast pain, which is a normal body change, not only will there be breast pain, but there may also be various symptoms such as dysmenorrhea. 2. It may be a problem caused by breast inflammation or breast enlargement, which will constantly stimulate their own breasts to produce breast pain. 3. There may also be problems caused by various factors such as excessive mood swings, mental tension or prolonged late nights. Therefore women must pay attention to regulate their mood during menstruation, it is best not to be overly tired, and properly relax their psychological pressure, which can relieve chest pain symptoms.