 [ Symptoms ] how much blood can you lose daily from rectal bleeding before you get other problems ie anemia fainting i am pretty sure i have ulcerative colitis but i am still going through diagnosis with my dr  is i go to the bathroom approx 15 times a day always with blood loss sometimes it is not an actual bowel movement it is just a lot of blood dripping out always bright red but with some clots if there is been any length of time between going even just passing gas releases blood which i always try to be on the toliet for at night there is quite a bit of leakage mucous blood andor very loose stool [ Disease ] i am sorry to hear you are going through this and i hope you get a diagnosis soon though i am hoping you do not have ulcerative colitis the thing with blood is that a little can look like a lot especially when it is dispersed in a bowl of toilet water even a couple drops of blood in the toilet can give the water the appearance a blood bath has taken place i mention this in part to help calm your anxiety about this the chances are you are not losing as much blood as you think if there is any way for you to measure the blood loss i know sounds gross but you could for example purchase from a medical supply store a hat or plastic measuring basin that fits under the toilet seat for those times when only blood comes out you would have a better idea of how much blood you are really losing it is probably not more than a tablespoon or so at a time but since i am not there to see it it could be more it would be good for your doctor to know losing blood is always unnerving but the human body can endure quite a lot of blood loss before serious problems occur if you do experience fainting or if your pulse rate stays elevated then you definitely need to call your doctor meanwhile you can help avoid those symptoms by drinking plenty of fluid to keep your circulating volume up i wish you all the best with this