<s>[INST] Hi, I was experiencing lower back pain on the right side this morning. I had a BM at 11:30am and there was blood in my stool, maroon in color, and thick. I am currently feeling pain in the lower right side of my back again. Is this something that I should be concerned with? [/INST] Hello,I had gone through the case and found that it might be internal hemorrhage or colitis.So immediate go for ultrasound of abdomen and blood test. After that take proper treatment .Hope my answer will be effective for you.Thanks </s>