Ovarian tumor twisting is caused by the following reasons: 1. the tumor is relatively large and has a certain weight, so it will lead to twisting of the tissues. 2. the tissues are relatively long before they twist, if the tissues are relatively short, they will not twist, when they twist, they will have acute lower abdominal pain, suddenly without inducements will lead to lower abdominal pain, which will be accompanied by nausea, vomiting and other corresponding symptoms. It is recommended to go to the hospital for examination as soon as possible. Ultrasound examination will reveal the presence of ovarian tumor and ischemia at the tip, which can make the corresponding diagnosis and require surgery if necessary.