Premenstrual tension syndrome refers to symptoms that occur 1-2 weeks before menstruation in women, with periodic episodes of symptoms that disappear after menstruation. Its symptoms consist of 3 main aspects: 1. physical symptoms, mainly headache, breast swelling and weight gain. 2. mental symptoms, such as anxiety, depression, emotional instability, and changes in sleep and libido. 3. behavioral changes, mainly lack of concentration in thought, low work efficiency and tendency to accidents. The above symptoms are most severe 2-3 days before menstruation, and will rapidly decrease after menstruation until they disappear. If the symptoms are not very severe, they can be corrected by dietary modifications such as salt restriction and coffee restriction. If it is more serious you can take vitamin B6, or take Danazol or Bromocriptine under the guidance of a doctor.