<s>[INST] I have a non painfull movement in my abdomen. i can feel it more frequently at night hours after iv eatin, it feels like it has grown in the past month, i will be laying flat and feel and see my stomach move from one side to the next and when i put my hand on it, it disapears. i am very thin, and when i suck in m stomach there is a noticable lump. i have regular bowl movements and iv always been a gasy person. im on the pill and when this first started took a preg test and it was negative...any ideas what i could have...thanks [/INST] Hi. Thanks for your query. Great history. Since you are very thing, it is normal to have and be seen the normal intestinal movements. Intestines allow forward passage of its contents, the food, to move forwards by a process called peristalsis and can be felt or seen in some thin people. Yet, it is better to confirm by a clinical examination by a Gastroenterologist/ General Surgeon to confirm this. You may need to undergo:X-ray in a standing position; Ct scan abdomen to see ad rule out another causes. </s>