The hidden pain at the bottom of the small abdomen at 22 weeks of pregnancy is mostly considered to be caused by physiological pain during pregnancy, pre-eclampsia and digestive system diseases, which can be examined at the hospital to clarify the causes and then dealt with accordingly. 1. physiological pain: the fetus grows continuously at 22 weeks of pregnancy and the uterus also increases in size, pulling the surrounding ligaments, which can lead to pain in the abdomen, which is normal physiological pain, and the pain is mild and can be relieved by itself, and can be properly treated. 2. Pre-eclampsia abortion: under the premise of confirmed intrauterine pregnancy, if the hidden pain at the bottom of the abdomen is more serious and accompanied by vaginal bleeding, pre-eclampsia abortion should be considered. You can go to the regular hospital for examination, under the guidance of the doctor for fetal preservation treatment, always pay attention to the observation of the pregnant woman, usually more rest, avoid extracting heavy objects; 3, digestive system diseases: pregnant women combined with appendicitis, gastroenteritis and other digestive system diseases, may also lead to the bottom of the small abdomen hidden pain. If accompanied by nausea, vomiting, diarrhea symptoms, consider acute gastroenteritis, can be conservative treatment, pay attention to a light diet, if the symptoms are more serious, should go to a regular hospital for consultation. If it is accompanied by abdominal pressure pain and rebound pain, it is considered acute appendicitis and other acute abdominal diseases, which can be treated surgically or conservatively, and the specific treatment plan should be determined by the doctor after examination.