It is a normal phenomenon of pregnancy, but it does not exclude the possibility of pre-eclampsia and ectopic pregnancy; nowadays, human chorionic gonadotropin (HCG) and vaginal ultrasound are commonly used to make a clear diagnosis. 1, the patient has been clearly intrauterine early pregnancy, at this time the stomach swelling is mainly considered to be physiological bloating caused by pregnancy, is a normal physiological phenomenon, due to early embryonic implantation, uterine ligament pulling, hormonal changes in the body level resulting in accelerated metabolism in the body may induce abdominal distension; often manifested as a short period of time, the lower abdomen both sides of the attack, aggravated by exertion, lying down after rest can be relieved; at this time should pay attention to maintenance, prevent cold, eat less If the bloating is prolonged and gradually aggravated, or accompanied by a little vaginal bleeding, the possibility of pre-eclampsia or miscarriage should not be ruled out, and the blood HCG and early pregnancy ultrasound should be rechecked at the hospital immediately to clarify the diagnosis. 2. If the HCG value has not been clearly identified as early intrauterine pregnancy (e.g. HCG is positive and the intrauterine fetal sac is not visible on vaginal ultrasound, and the doctor suggests to retest after one week; or if the pregnancy is detected by the pregnancy test by oneself), and the stomach is distended, one should be alert to the possibility of ectopic pregnancy and should go to the hospital to retest the above two indexes; if the HCG value increases and the ultrasound reveals a mass in one of the fallopian tubes and there is no fetal sac in the uterus, ectopic pregnancy is highly suspected and requires inpatient chemotherapy or surgery. If the HCG value drops significantly and there is no abnormality in ultrasound, it indicates biochemical pregnancy; abdominal distension and pain in ectopic pregnancy is often manifested as prolonged, episodic distension and pain in one side of the lower abdomen, which is mainly painful and gradually intense, and even life-threatening fainting. In conclusion, the lower abdominal distension in early pregnancy should be identified as physiological or pathological, and difficulties in self-identification require hospital consultation.