The vague pain in the stomach at 15 weeks of pregnancy may be caused by pre-eclampsia miscarriage, digestive system diseases and gynecological diseases, and the treatment plan is different according to the causes: 1. pre-eclampsia miscarriage: if a pregnant woman has vaginal bleeding in addition to vague pain in the stomach, she should be alerted to whether it is pre-eclampsia miscarriage, and should seek medical attention in time and carry out fetal preservation treatment under the guidance of a doctor. 2. Digestive system diseases: If pregnant women have vague stomach pain, accompanied by diarrhea, vomiting and other symptoms, it may be caused by enteritis, gastroenteritis and other diseases, and symptomatic treatment can be carried out under the guidance of a doctor. If there is a bacterial infection, take antibiotics as prescribed by the doctor, and if necessary, take gastric mucosal protectants, etc. for treatment. In the case of unclean food, conservative treatment is recommended by taking oral antidiarrheal agents such as montelukast as prescribed by the doctor, and paying attention to replenishing body fluids. In addition, there are also a few pregnant women who suffer from appendicitis, cholecystitis, cholelithiasis and other diseases that cause vague stomach pain, these cases belong to the more difficult pregnancy complications in obstetrics and should be treated by a doctor in time, depending on the specific circumstances of conservative treatment or surgery; 3, gynecological diseases: if the pregnant women themselves suffer from gynecological diseases, such as pelvic inflammatory disease, vaginitis, etc., they may also have vague stomach pain, and need to consult a doctor to clarify the cause. It is necessary to consult a doctor to clarify the cause. If the symptoms are mild, you can follow the doctor’s advice to use topical drugs with weak irritation, if the inflammation is more serious, you need to consider taking antibiotics for treatment. Pay attention to keep your vulva clean and change your underwear regularly to avoid infections from pathogenic bacteria in your daily life.