The distinction between benign and malignant ovarian tumors can be made in several ways. First, symptoms. Generally benign tumors mostly have no symptoms, and most of the patients find them out when checking their body. Secondly, patients with malignant ovarian tumors mostly have symptoms, which can be manifested as poor diet, gastric digestive discomfort, ascites, abdominal distension and so on. Thirdly, through ultrasound examination, benign tumors under ultrasound have very clear boundaries and are usually cystic. And malignant tumors have unclear border and cystic solidity, accompanied by ascites. Fourth, tumor marker. Tumor markers of benign tumors are generally normal, while malignant tumors can be elevated. Fifth, general condition of patients. Patients with benign tumors are generally in good condition and their diet is not affected, while patients with malignant tumors can have malignant disease.