The right side of the abdominal pain in the first month of early pregnancy can be caused by appendicitis, right fallopian tube pregnancy and other reasons, but may also be a normal physiological reaction in early pregnancy, you need to go to the hospital for relevant examinations in time to clarify the specific causes, and then for symptomatic treatment. 1, physiological abdominal pain: mainly for the normal performance of early pregnancy reaction, generally intermittent pain, and the pain is relatively mild, may be manifested as the right side of the abdominal tearing pain. The pain is usually intermittent and mild. Patients may experience the same discomfort in the lower abdomen as during menstruation due to the rejection contraction when the fertilized egg is laid in the uterus, which may cause painful symptoms. Usually physiological abdominal pain does not require special treatment, but continue to observe the symptoms and perform regular obstetric examinations, and also supplement folic acid tablets in time under the guidance of a doctor; 2. Appendicitis during pregnancy: the typical symptom of appendicitis is right lower abdominal pain, and there may be a pulling sensation when the pain is severe. Appendicitis can easily lead to miscarriage during pregnancy and threaten the safety of the fetus, so when appendicitis occurs in early pregnancy, you need to go to the hospital in time and take appendectomy for treatment under the guidance of professional doctors. In principle, surgery is the main treatment, but in early pregnancy or in patients with mild symptoms, methotrexate and other chemical drugs can be used to kill the embryonic cells and then the fallopian tube can absorb the lesions by itself; 4, other: ovarian cysts, uterine fibroids and other diseases can lead to right lower abdominal pain, when the early pregnancy symptoms, ultrasound, serum HCG test and progesterone need to be performed in a timely manner. When discomfort occurs in early pregnancy, ultrasound, serum HCG test and progesterone test should be performed to rule out lesions.