Polycystic usually refers to polycystic ovary syndrome, and sudden normal menstruation is considered to be related to stable control of the condition. Polycystic ovary syndrome is a common endocrine metabolic disease, mainly characterized by hyperandrogenism, and these patients tend to have abnormal menstruation, hirsutism and acne, and infertility. Most of the causes of normal menstruation in patients with polycystic ovary syndrome (PCOS) are related to better control of the disease, which indicates that the hormone levels in the patient’s body are gradually returning to normal. Symptoms of polycystic ovary syndrome can also improve significantly, including abnormal menstruation that gradually returns to normal. Because the cause of the disease is not yet clear and it cannot be completely cured, it is recommended to actively cooperate with the doctor to give treatment and life adjustments to improve the patient’s quality of life.