The symptoms before menstruation are all present, but the period hasn't started. Why is this happening, and what should I do?

　　"Menses" refers to menstruation. Experiencing premenstrual symptoms but not having a period indicates delayed menstruation, which may be related to stress, pregnancy, endometriosis, polycystic ovary syndrome (PCOS), uterine fibroids, and other factors. Depending on the underlying cause, treatment options such as lifestyle adjustments, medication, or surgery may be used to improve symptoms. It is recommended to visit a hospital to determine the exact cause and follow medical advice for appropriate treatment. The analysis is as follows:

　　1. Stress

　　If a woman experiences excessive stress or significant work-related pressure in daily life, it may lead to delayed menstruation, dysmenorrhea, or even amenorrhea. Therefore, maintaining a relaxed mood in everyday life is important to prevent menstrual delays and promote overall health.

　　2. Pregnancy

　　After conception, rapid hormonal changes—such as increased levels of human chorionic gonadotropin (hCG) and progesterone—can cause symptoms similar to those before menstruation, including mild abdominal or breast distension, along with missed periods. This is a normal physiological phenomenon and generally does not require special treatment.

　　3. Endometriosis

　　Frequent contractions of the uterine muscle layer may lead to enhanced or abnormal endometrial activity, resulting in heavy menstrual bleeding or delayed periods. For mild cases of endometriosis, medications such as Danazol Capsules, Medroxyprogesterone Acetate Tablets, or Norethisterone Tablets may be prescribed under medical supervision.

　　4. Polycystic Ovary Syndrome (PCOS)

　　Hormonal imbalances in PCOS primarily manifest as infrequent menstruation or amenorrhea, shortened or prolonged menstrual duration, reduced menstrual flow, irregular cycles, or abnormal uterine bleeding. It is recommended to use medications such as Dydrogesterone Tablets,Progesterone Soft Gelatin Capsules, or Letrozole Tablets under a doctor's guidance to relieve symptoms.

　　5. Uterine Fibroids

　　Uterine leiomyomas, especially submucosal leiomyomas, may rapidly enlarge the uterine cavity and cause abnormal contractions. During this process, patients may experience various abnormalities, including menorrhagia and delayed menstruation. If large fibroids compress the bladder or rectum and cause related symptoms, surgical interventions such as myomectomy, hysterectomy, or hysteroscopic/laparoscopic procedures are recommended.

　　Maintain a regular sleep schedule and avoid staying up late. Change sanitary pads frequently during menstruation, stay warm, and avoid strenuous exercise. Learn to manage emotions, maintain a calm and positive mindset, and use contraception methods—such as condoms or oral contraceptives—appropriately.