There are several reasons for irritability during the physiological period: 1. Endocrine disorders, abnormal changes in sex hormone secretion during menstruation are likely to result in irritability, irritability, irritability and other symptoms and performance. Especially androgen, progesterone, lactogen or thyroid hormone secretion abnormalities are likely to cause greater changes in mood. 2, physiological period easily accompanied by symptoms of physical pain, when physical discomfort is easy to cause mood swings, such as abdominal pain, sleep difficulties, decreased appetite, etc., these are easy to become anxious, irritable, irritable. 3, may be in the physiological period encountered frustration, in the face of When the frustration is easy to let people appear negative defense way, especially the emergence of frustration-aggressive behavior pattern, this time is easy to appear in the physiological period irritable, irritable situation. These reasons are more common.