Pain in the left lower abdomen during coitus is most commonly caused by inflammation of the left adnexa, and in daily life there is also vague pain in the left lower abdomen accompanied by increased vaginal discharge, it is recommended to give treatment with broad-spectrum antibiotics. If there is no drug allergy, you can take cefuroxime tablets orally, take 1 tablet twice a day for 7 days. At the same time, you can take the Chinese patent medicine Gynecological Qianjin Tablets orally for treatment, and it is recommended to take it orally after meals because Gynecological Qianjin Tablets may cause gastrointestinal reactions. In addition, you can do hot compresses on the lower abdomen, mainly to promote the absorption of inflammation, and it is recommended to do ultrasound examination to find out whether there is tubal fluid.