A bit of soreness on the left side of a woman’s abdomen can be caused by ovarian cysts, left adnexitis, endometritis, and ectopic pregnancy. Patients can choose to have regular observation, take medication and undergo surgery for treatment. 1. Ovarian cyst: a cystic structure formed in the ovary and filled with fluid, which can usually subside on its own but may cause symptoms such as a bit of soreness on the left side of the abdomen. Patients can observe it regularly according to their condition, and if it subsides on its own, there is no need for treatment. 2. Left adnexitis: when the patient’s left ovary or fallopian tube is inflamed, it will be manifested as soreness in the left side of the abdomen, accompanied by fever, the patient can take metronidazole, levofloxacin, cefaclor and other drugs to fight infection. 3. Endometritis: the patient’s uterine lining is infected by the inflammatory reaction, the patient will appear on the left side of the lower abdomen with a slight soreness and other symptoms, the patient can choose doxycycline and other drugs for treatment. 4. Ectopic pregnancy: when a female patient is pregnant, the fertilized egg attaches to and grows outside the uterine cavity, such as the left fallopian tube, and when it grows to a certain extent, the patient will feel symptoms such as obvious soreness and pain in the left side of the abdomen. Patients can choose to have surgery for treatment. When female patients experience soreness on the left side of the abdomen, it is recommended that they go to the hospital in time for treatment.