The hidden pain on the left side of the abdomen in early pregnancy may be a normal reaction to pregnancy, or it may be caused by abnormalities such as pre-eclampsia, ectopic pregnancy, etc. It needs to be judged according to the specific situation, and pregnant women need to seek medical advice in time to identify the causes and carry out symptomatic treatment to avoid delaying the condition, for the following common reasons: a. Physiological reasons The uterus will gradually increase in size after pregnancy, and if the uterine ligaments are stretched, it may lead to lower abdominal uterine side or If the uterine ligaments are stretched, it may lead to different degrees of pain on one or both sides of the lower abdomen. Pregnant women can be relieved by bed rest and generally do not need special treatment. Pathological causes 1, digestive system diseases: such as enteritis, intestinal flatulence, etc. can cause abdominal pain, and should be promptly consulted for appropriate treatment. It is recommended that intravenous medication, vitamins, electrolytes, etc. be administered as prescribed by the doctor, or medication should be applied under the guidance of the doctor to improve the symptoms of discomfort, but not blindly on your own, so as not to affect the health of the fetus; 2. Pre-eclampsia: in addition to abdominal pain, it can also be accompanied by a small amount of vaginal bleeding, which requires blood HCG, ultrasound examination, progesterone or dydrogesterone under the guidance of the doctor for fetal preservation treatment, and if necessary, termination of pregnancy; 3. Ectopic pregnancy. If the embryo is laid in one of the ovaries or fallopian tubes and ruptures after activity or at a certain period of time, ectopic pregnancy will cause abdominal pain on one side. It is generally recommended that surgery be performed in a timely manner to avoid serious consequences such as hemorrhage and uterine cavity infection due to rupture of the gestational sac; 4, ovarian corpus luteum cyst torsion: trauma, pelvic inflammatory disease, ovarian uterine congestion and other causes can lead to torsion and rupture of the corpus luteum cyst, which is clinically manifested by abdominal pain and abdominal discomfort. If the pain persists, medical examination and treatment is required. In the first 3 months of pregnancy, the placenta and the uterine wall of the mother are not yet stable, so you should avoid strenuous activities and sexual intercourse to avoid contractions of the uterus that may cause preterm miscarriage. If the pain on the left side of the abdomen is only due to a reaction to pregnancy, you should rest in bed, replenish your body with the necessary nutrients and avoid vaginal examinations as much as possible. If you have vague abdominal pain with vaginal bleeding, you should go to the hospital immediately to avoid negative consequences.