Bleeding during ovulation may be caused by ovulation bleeding, cervicitis, cervical squamous intraepithelial lesion, cervical cancer and other reasons. 1. Ovulation bleeding: ovulation coitus, follicle discharge, estrogen level in the body drops slightly, progesterone level is insufficient, resulting in endometrial breakthrough bleeding. It causes vaginal bleeding. 2. Cervicitis: external pathogens or endogenous pathogens invade the lining of the cervical canal, causing congestion and edema of the cervical mucosa, sexual stimulation of the cervical canal mucosa, causing bleeding after intercourse; chronic inflammation of the cervix, cervical polyp formation, cervical polyps are brittle, and sexual stimulation is easy to lead to bleeding, ovulation intercourse can cause bleeding. 3. Cervical squamous intraepithelial lesion: prolonged infection with papillomavirus, early sexual life, multiple sexual partners and cervical squamous intraepithelial lesion are closely related, cervical squamous intraepithelial lesion can cause bleeding after sex or gynecological examination, vaginal discharge and other symptoms, and ovulation can cause bleeding during intercourse. 4. Cervical cancer: cervical squamous intraepithelial lesion develops persistently and invades the interstitium of the cervix to form cervical cancer. Cervical cancer can appear contact bleeding, increased menstrual flow and other symptoms, ovulation can lead to bleeding. In addition, there may be other reasons for bleeding during ovulation, so it is recommended to consult a doctor in time to find out the cause of the disease and give treatment under the guidance of a professional doctor.