Hi. Thanks for your query. Noted the history, albeit short and specific, thighs chill or move just before passing bowel movements, then you go and everything is all good till you need to go once again, passing large bowel movements since then... As per the history you have provided the probable causes can be: This looks to be an exaggerated autonomous nervous system comprising sympathetic and parasympathetic. Another possibility is that of colitis with inflammation around the colon from where the nerves to the thigh pass and hence movement of the colon causes the symptoms: I would advise you the following in such a situation: Clinical evaluation and examination by a Gastroenterologist. Colonoscopy. CT scan of the abdomen. Tests of stool, blood and urine. All these will give a proper diagnosis and a plan of proper management.