Hi I am a 24 year old male medical school student. I have been taking vyvanse for the past 6-8months or so. Correlating with taking the vyvanse i have been experiencing blood in my stool frequently. I assume the cause is hemroids probably due to the increased heartrate and cardiac output i display. Is this correct? Why would this be happening, and why if at all would vyvanse cause these symptoms? How conscerned should i be about it?