Beating under the raphe may be caused by strenuous activity, muscle spasm, abdominal aortic aneurysm and so on. 1. Strenuous activities: generally after strenuous exercise, the heart will undergo violent beating, and feel obvious beating under the raphe, and breathing is also more rapid. 2. Muscle spasm: it is usually caused by local over-exercise, which leads to excessive fatigue of the rectus abdominis muscle area, and the feeling of beating under the raphe when resting because of muscle spasm. 3. Abdominal aortic aneurysm: patients usually do not have clear symptoms, but in the attack of the disease, it may lead to subacromial throbbing, and this is a kind of critical disease, the mortality rate is relatively high. If you feel the throbbing under the raphe and accompanied by uncomfortable symptoms, you should consult the doctor in time to avoid delaying the treatment and causing danger.