When the left side of the stomach hurts in the 6th month of pregnancy, the first thing to determine is whether it is fetal movement or stomach pain. If the limbs of the fetus are more active on the left side and fetal movement occurs, it can stimulate the uterine wall, causing slight contraction of the uterine muscles and pseudo contractions, and the pregnant woman feels tightness and hardness in her stomach or has a slight pain in the left lower abdomen, but this pain is relatively light. If it is not fetal movement, it is necessary to consider whether there are other factors. 1. ligament pulling around the uterus: as the gestational week grows, the uterus gradually grows, the ligament around the uterus will be passively pulled, and most of the uterus will physiologically rotate to the right, so the ligament on the left side is more likely to be pulled, which causes pain. 2. colitis: such as inflammation of the sigmoid colon. Pregnant women may be infected with pathogens or consume cold and irritating food, resulting in symptoms such as diarrhea, left abdominal pain, or even bloody stools. Pay attention to a light diet, eat more easily digestible foods, and do not eat spicy, greasy and cold foods. Pay attention to hydration to prevent dehydration and electrolyte disorders, and follow medical advice for treatment if necessary; 3. Urinary system stones: such as left ureteral stones. Due to the pressure of the uterus on the ureter, the ureter undergoes dilatation and the color of urine turns red, accompanied by symptoms of left-sided abdominal pain. Pregnant women need to go to the hospital for a color ultrasound to rule out any fetal abnormalities or urinary tract infections. If the symptoms are mild, you can promote the discharge of stones by drinking plenty of water every day. If the symptoms are more severe, proper treatment is required according to medical advice. 4. Adnexal torsion or ovarian cyst torsion: As the uterus grows, the ovarian cyst is passively compressed and may be torsional, or in the absence of an ovarian cyst, torsion may occur due to squeezing of the fallopian tubes and ovaries together. In either case, prompt medical attention is recommended if the pain is severe, or if there is vaginal bleeding, abnormal fetal movement, or fever.