 [ Symptoms ] what is causing the calf muscle pain that happens only when i stand up i am currently up to six days of watery diarrhea  the pain is specifically in the posterior region of my calf it started out at the top of my calf muscle and all the way down to my ankle but currently it is at the inferior part of my leg and goes down to the top part of my ankle it is like a throbbing pain as i stand up it is like when the circulation comes back and it hurts when i feel the area it hurts when i lay back down it does not hurt as much this all started with my diarrhea [ Disease ] either mild heart attack or stroke can produce the symptoms you name i would advise that you be seen promptly for post event evaluation by a medical professional regards red lawhern ph d