If the stomach hurts the day after intercourse, the most common cause is caused by chronic pelvic inflammatory disease. This condition often has pain in the lower abdomen in normal life, and the pain will be aggravated when menstruation or after exertion, and the discharge is usually more, you can carry out anti-inflammatory treatment, for example, you can take oral gynecological Qianjin tablets or gynecological Yanjing capsules for 7 days, and at the same time, you can do hot compresses on the lower abdomen. If the symptoms do not disappear after 3 days of continuous medication, it is recommended to go to the hospital for a gynecological examination and, if necessary, an ultrasound. It is also recommended to rule out the possibility of endometriosis if the stomach hurts the day after intercourse. This condition is often accompanied by progressive aggravation of dysmenorrhea in daily life, so a gynecological examination is recommended to exclude endometriosis and give medication according to the results.