I was in a relatively serious car accident earlier this week, where I was struck by a vehicle while crossing the street. I was knocked unconscious, had several teeth knocked out, required 15-20 stitches to my lips and mouth and have bumps, bruises and cuts all over my body. I was released from the trauma unit at the hospital after about 18 hours. I had not passed a stool for at least 3 days, as I have been on a liquid diet and I cannot eat. However, I experienced diarrhea 4-5 times last night with hardly any solids. I cannot tell definitively, because my toilet bowls are black, but on the toilet paper, there was a red/maroon liquid. Could this be from the blood that I am swallowing from my mouth injuries or something more serious that will require a trip back to the hospital, in your 30-second opinion?