Lying on your stomach and feeling your stomach jumping may be a normal phenomenon, or it may be caused by stomach disease, heart disease, abdominal aortic pulsation, calcium deficiency and other reasons. 1. Normal phenomenon: If there are no other abnormal manifestations, such as stomach pain, abdominal distension, etc. may be the heart beat, the stomach and the heart is relatively close to the heart, the heart beat can easily be transmitted to the abdomen caused by beating, especially thin people lying down when touching the stomach can feel the beat. 2. Stomach diseases: such as gastritis, peptic ulcer, etc., when the mucous membrane of the stomach is stimulated by gastric acid, causing stomach cramps and leading to stomach beats. 3. Heart disease: if suddenly the stomach beats obviously, it may be due to coronary heart disease, myocardial infarction and other reasons. 4. Abdominal aortic beating: the direction of the abdominal aorta is mainly in the back of the stomach and duodenum, when the abdominal aorta atherosclerosis, arteritis, there will be abdominal aortic beating, so the patient will feel as if the stomach is beating. 5. Calcium deficiency: Calcium deficiency induces the abdominal muscles to throb, which will be manifested as the stomach is throbbing. Lying down when touching the stomach feel stomach jumping, there are other reasons, if the discomfort, it is recommended that timely medical care, identify the cause of the early treatment, so as not to miss the condition.