The difference between benign and malignant ovarian cysts mainly lies in its symptoms and auxiliary examination. 1. Symptoms: benign ovarian cysts often have no obvious symptoms when they are small, and when they increase in size, they may have abdominal distension, abdominal mass, and pressure symptoms such as frequent urination and urgency of urination. Ovarian malignant tumor invasive growth, can be adhered to the surrounding tissues, abdominal pain and so on, but also can have emaciation, anemia, abdominal fluid and other manifestations. 2. Auxiliary examination: benign ovarian cysts ultrasonography generally suggests a liquid dark area, there may be intervals of light and clear edges. In malignant cases, the ultrasound often suggests the presence of disorganized light clusters, light spots or cystic solidity within the liquid dark area, with unclear borders. Malignant patients often have elevated tumor markers such as CA125, etc. Cancer cells can be seen in pathological biopsy. Pathologic diagnosis is the gold standard for distinguishing between benign and malignant ovarian cysts. If ovarian cysts are found, it is recommended to consult a doctor as soon as possible to clarify the nature of the cysts and actively cooperate with the treatment to avoid delaying the condition.