Sudden severe pain in the left lower abdomen, nausea, cold sweat after a while, may be due to intestinal spasm, colitis, adnexitis and other diseases. 1. Intestinal spasm: Intestinal spasm is a symptom caused by paroxysmal strong contraction of the smooth muscle of the intestinal wall, if the spasm occurs in the distal colon, it will cause severe pain in the left lower abdomen, nausea, cold sweat. Spasmodic pain after a period of time can be relieved on their own, if necessary, need to use pivotal ammonium bromide and other antispasmodic pain treatment. 2. Coloproctitis: Coloproctitis is caused by bacterial, fungal, viral, parasitic infections resulting in inflammatory lesions, the patient will also have severe pain in the lower left abdomen, the symptoms can be relieved after defecation. It can be treated with antibiotics such as ofloxacin as prescribed by the doctor. 3. adnexitis: female patients also need to be vigilant about gynecological diseases, adnexitis is a relatively common gynecological diseases, is an inflammatory lesion that occurs in the ovarian canal and ovaries, patients will also have varying degrees of abdominal pain, often accompanied by symptoms of fever. Treatment is required as prescribed by the doctor. If you are unable to determine the specific cause of the disease, you need to go to the hospital in time to carry out relevant examinations to clarify the diagnosis, and then carry out treatment.