If a woman suddenly does not have a period and is not pregnant, usually the patient’s age varies and the reasons vary, specifically consider the following situations: 1. Irregular menstruation due to business trips, fatigue, anger and emotional changes such as staying up late. If you are not pregnant, it is recommended to check endocrine laboratory tests, thyroid function and ultrasound to further determine the cause of delayed menstruation; 2, abortion, curettage surgery, etc., can be caused by endometrial damage, resulting in thin endometrial adhesions, at this time, it is recommended that patients go to the hospital to do ultrasound examination; 3, polycystic ovaries, hyperprolactinemia, hyperandrogenemia and other causes, common in women over 35 years of age with ovarian dysfunction; 4, ovarian decline 4. Delayed menstruation caused by ovarian function decline is common in women over 45 years old, and the specific cause can be further clarified according to endocrine laboratory tests. In conclusion, if a woman suddenly does not have a period and is not pregnant, it is recommended to go to the hospital for a timely examination, make a reasonable judgment based on the examination results and the patient’s own situation, and provide the right treatment.