Not pregnant belly jumping may be the abdominal aortic pulsation, muscle tissue spasms and other causes. 1. Abdominal aortic pulsation: some women have thin bodies and thin abdominal walls, and when they lie down with a flat abdomen, they may feel the pulsation of the abdominal aorta, which is manifested as a throbbing in the abdomen. 2. Muscle tissue spasms: women’s recent mental stress is relatively large, the abdomen is cold and other factors, so that the abdominal musculature by external stimuli triggered reflex contraction, muscle tissue spasms in the case of abdominal jumping and jumping performance, the woman at this time is not pregnant. There are many reasons why the abdomen jumps when you are not pregnant, and if it is accompanied by other uncomfortable symptoms, such as abdominal pain, pressure pain, etc., please consult a doctor in time to check and deal with it.