The feeling of falling in the abdomen in the fourth month of pregnancy may be physiological, or it may be caused by pathological factors such as slight cracks in the ligaments of the uterus and preeclampsia. Physiological factors: four months pregnant with the continuous development of the fetus, can cause the uterus to increase, abdominal pressure rises may cause the abdomen to drop feeling, if there is no other discomfort, such as pain, vaginal bleeding, etc. Considering that it is a normal physiological phenomenon, pregnant women do not need to be overly anxious and worried about it, regular checkups to maintain a good mood. Pathological factors 1. Slight cracks of uterine ligaments: mostly related to the enlargement of the fetus and the uterus, the continuous development and growth of the fetus may increase the pressure on the uterine ligaments, which may easily lead to slight cracks, resulting in the symptom of abdominal drop. 2. Pre-eclampsia: If there are obvious symptoms of abdominal drop in the fourth month of pregnancy, accompanied by pain and vaginal bleeding, it is considered to be caused by pre-eclampsia. If you have a problem with the abdomen falling in the fourth month of pregnancy, it is recommended to go to the hospital in time to complete the examination and find out the cause of the abdomen falling sensation and then actively treat it, so as to avoid delaying the condition.