It is not true that the more you are afraid of delayed menstruation, the less you will come. Delayed menstruation may be caused by pregnancy, surgery, endocrine disorders, mental factors, etc. It is recommended to consult a doctor in time to find out the cause and treat under the doctor’s guidance. 1. Pregnancy: If you have sex and don’t have your period, you should first consider pregnancy and go to the hospital for blood and urine HCG tests. 2. Mental factors: such as mental tension, stress, environmental changes and other factors can cause delayed menstruation. Women’s menstruation is regulated by hormones, and hormones are controlled by the endocrine system, the endocrine system will be affected by the environment and emotions, when the mood changes, it may make the endocrine dysfunction, leading to abnormal ovarian function, resulting in estrogen and progesterone levels will be changed, which will be manifested as irregular menstruation. 3. Surgical causes: such as uterine cavity or cervical adhesions caused by uterine surgery, resulting in menstrual blood can not be produced or discharged, no menstrual flow. 4. Endocrine disorders: Obesity, excessive dieting, irregular living, premature ovarian failure, polycystic ovary syndrome, etc. can cause endocrine disorders and delayed menstruation. If the symptoms of delayed menstruation are serious, or if the symptoms persist and do not improve, the patient should go to the hospital in time for treatment.