Chocolate cysts are one of the endometriosis, which refers to the growth of ectopic endometrium in the ovary and thus the formation of cysts, and patients may present with symptoms such as dysmenorrhea, abnormal menstruation and even infertility. The cause of chocolate cysts is still unclear, and most of them are thought to be caused by the endometrium growing into the ovary through blood vessels and lymphatic vessels, and may also be related to the body’s immune function, genetic factors, environmental factors, etc. 1. Immune factors: ectopic endometrium is usually found and cleared by the immune system in the blood, and if the patient’s body If the immune function of the patient is abnormal, the endometrium that is free to the outside of the uterine cavity through the blood and other channels cannot be removed, thus chocolate cysts occur; 2, genetic factors: the disease usually exists in the family aggregation, generally if the mother, sisters and other immediate family members suffer from chocolate cysts, the probability of getting chocolate cysts will increase; 3, environmental factors: such as lifestyle and work, such as If patients often stay up late at night, have high stress, do not pay attention to exercise, high weight, etc., which leads to endocrine disorders and disorders of hormone levels in the body, they are also prone to chocolate cysts; 4, other factors: if patients often have sex during menstruation, or infection and other reasons leading to pelvic inflammatory disease, they are also prone to chocolate cysts; if patients have abnormal development of the reproductive tract, such as lower genital tract obstruction, it is easy to lead to obstruction of menstrual blood discharge, which is prone to flaking during menstruation. It is easy to cause the endometrium that is exfoliated during menstruation to retrograde and implant into the ovaries, inducing chocolate cysts. If a patient suspects that she has a chocolate cyst, it is recommended that she undergoes a gynecological examination and laparoscopy to determine whether she has the disease. If diagnosed, they can be treated with non-steroidal anti-inflammatory drugs or hormonal drugs such as oral contraceptives and progestins under the guidance of a professional doctor. However, if the symptoms are severe, surgical treatment may be considered.