 [ Symptoms ] my muscles are very weak cancer has been ruled out…i am lost [ Disease ] without the ability to examine you first hand i would have no way of determing the reason for your symptoms but i can tell you that there are many arteries in the abdominal cavity that pulsates as well as intestinal parestalsis the rhythmic movement of the colon not unlike a snake moving if your doctor cannot find a reason consider seeing a different medical provider for a second opinion or ask for an abdominal ultrasound