Pain in the left lower abdomen after intercourse is often caused by changes in hormone levels in the body, rough sexual intercourse, and may also be caused by a combination of other gynecological diseases, such as endometritis, endometriosis, ovarian cysts, etc. If a woman’s left lower abdominal pain persists without relief after intercourse, it is recommended to go to the hospital in time for ultrasound, white belt routine, colonoscopy and other related examinations for clear diagnosis and treatment. Common causes and treatment methods a. Physiological causes: 1. Hormone level change: The hormone level in women’s body will change after intercourse, which may lead to the symptoms of left lower abdominal pain. Usually can be relieved after rest, no need to worry too much; 2, rough intercourse: too much action during intercourse, too rough, stimulating uterine contraction, may lead to pain in the lower left abdomen, usually after intercourse to pay attention to rest can be relieved. Second, pathological causes: 1, endometrial and cervical diseases: (1) endometritis: if women suffer from endometritis, can be manifested as lower abdominal pain, increased leucorrhea, lower abdominal swelling, generally persistent abdominal pain, will be aggravated after activity or sexual intercourse, can appear after intercourse, the symptoms of left lower abdominal pain. It is mainly treated with antibiotics, and if necessary, uterine drainage is feasible, or surgical removal of fibroids and polyps; (2) endometriosis: women with combined endometriosis will have dysmenorrhea, non-menstrual abdominal pain, painful intercourse and painful defecation, etc., i.e., left lower abdominal pain may occur after intercourse. Oral contraceptives, progesterone, and gonadotropin-releasing agonists can be taken under medical supervision, and conservative, semi-radical, radical, and adjuvant surgical treatment can be taken if necessary. (3) Cervicitis: In women with combined chronic cervicitis, it can manifest as pain in the lower abdomen or lumbosacral region, which is aggravated during menstruation and defecation, and there can be painful intercourse, i.e., pain in the left lower abdomen after intercourse. Usually antibiotics, such as ceftriaxone sodium, azithromycin and other drugs can be used for symptomatic treatment, and if necessary, the surgical method of polyp removal is used for treatment. 2, adnexal diseases: (1) ovarian cysts: if a woman has ovarian cysts in combination, she can show symptoms such as pain in the pelvic area and pain during intercourse, that is, she may have pain in the left lower abdomen after intercourse. In general, ovarian cysts will subside or shrink on their own in 3-6 months. If the cyst is pathological, short-term treatment is available and surgical removal of the cyst is feasible if necessary; (2) adnexitis: if the woman herself suffers from adnexitis, she can experience increased vaginal discharge and pain in the lower abdomen, which is persistent and worsens after activity or intercourse. Treatment can be under the guidance of a doctor using broad-spectrum antibiotics such as penicillin and gentamicin, and if necessary, the treatment of transabdominal or laparoscopic excision of the lesion can be chosen. 3. pelvic disease: If a woman is suffering from pelvic inflammatory disease, she can show persistent lower abdominal pain, which is aggravated after activity or intercourse, and also left lower abdominal pain after intercourse. Treatment should pay attention to bed rest, and can be treated with penicillin or third- or fourth-generation cephalosporins as prescribed by the doctor. 4. Non-reproductive system diseases: If women have combined digestive system diseases, such as enteritis, chronic colitis, intestinal ulcers, ulcerative colitis, and intestinal tuberculosis, they may have left lower abdominal pain. In addition, diseases of general surgery, such as hiatal hernia, rectal hernia, and femoral hernia, can also cause left lower abdominal pain in women and should be identified. In men, if there is pain in the left lower abdomen after intercourse, there may be a combination of other diseases, such as digestive system diseases. For urological diseases, such as kidney and ureteral stones, especially at the third stricture, men will present with left lower abdominal involvement-like pain. Men with malignant tumors such as bowel cancer will also experience pain in the left lower abdomen, and the discomfort may be more pronounced after intercourse. It is recommended to go to the hospital in time for ultrasound, CT, colonoscopy and other related examinations to clarify the cause and give treatment.