What could cause pain in intestine area and blood in stool?

Endoscopy : Blood in stool can appear in two forms,in black and tarry color or red color,in red that means that bleeding is in lower intestine if black means bleeding in stomach and upper intestine,could be bacterial infection that caused bleeding,ask your doctor as soon as possible to do endoscopy to see whats causing blood.

Wide diagnosis: I am not a Gastroenterologist, but the issue you describe has a very wide range of possible diagnoses. Ulcers of the bowel, such as colitis, diverticulosis, polyps or a tumor can all cause such symptoms. Hemorrhoids cause bleeding very often, but they don't explain the abdominal pain. It's very easy to have an endoscopy and colonoscopy and find out immediately what might be causing your issues.

Infection: Can be bacterial infection,you should do stool analysis to see if there is bacteria or an infection.

Needs evaluation : These are concerning symptoms in the context of abdominal pain with associated blood in your stool. I would make it a point to call your medical provider who will need to evaluate The problem more thoroughly.while there are minor problems that can give the symptoms, there are more ominous things that need to be ruled out. If pain and bleeding is not tolerable go to ER.