If the symptoms of tightness and swelling in the abdomen are mild, they are usually caused by physiological factors. If the symptoms are serious and accompanied by other abnormalities, they can be considered to be caused by pathological factors, including pre-eclampsia, ectopic pregnancy, pregnancy with ovarian cyst torsion, gastrointestinal diseases, etc. The causes should be clarified and appropriate measures should be taken. The causes should be identified and appropriate treatment measures should be taken. Common causes 1. Physiological phenomenon: As the fetus gradually becomes bigger, the size of the uterus will also increase, squeezing the surrounding organs and pulling the round ligament of the uterus, manifesting as tightness, stiffness and swelling on one or both sides of the abdomen, which is generally mild and will mostly resolve on its own without special treatment; 2. A small amount of vaginal bleeding, which starts bright red or pink and gradually turns dark brown. Some people may also experience back pain, bloating and abdominal pain. If these symptoms occur, you should be alert to the possibility of pre-eclampsia. It is recommended to seek medical attention immediately to make a clear diagnosis and then perform fetal preservation treatment; 3. ectopic pregnancy: ectopic pregnancy may occur in the fallopian tubes, cervix, ovaries or even abdomen, most commonly in the fallopian tubes. Initially it can be a vague painful sensation, which may increase as the embryo gradually grows in size, leading to rupture of the fallopian tube and increased pain. As the condition develops, the amount of bleeding will also increase. Generally, this condition can be considered as ectopic pregnancy, which should be promptly treated with blood tests and ultrasound to confirm the diagnosis and then actively undergo conservative treatment or surgery; 4. The condition is critical, you should go to the hospital for surgery; 5, gastrointestinal diseases: early pregnancy tightness and distension of the abdomen, in addition to gastrointestinal diseases, such as appendicitis, gastrointestinal inflammation may lead to these symptoms in the abdomen, sometimes accompanied by fever, nausea, vomiting, diarrhea and other performance, need timely treatment, so as not to delay the disease and affect the development of the fetus. After confirming your pregnancy, you should have regular maternity checkups, keep track of the fetus, try to stay away from places with radiation (such as hospital imaging departments and radiation treatment rooms), and avoid heavy physical labor. If your work or living environment has an impact on your health and rest, you should pay attention to changing your living conditions and take leave or transfer as needed.