My Husband Has Blood In Stools

So my husband has informed me that he has been having blood in his stools. But not only that, he said its enough blood that it turns the water red and theres a lot of blood on the toilet paper. He said that it hurts pretty bad, and that sometimes it takes him like a half hour to have a bm. You should also know that he is constipated a lot due to the fact that he is on and off narcotics for about 2 years now due to chronic back injuries. I've researched a little about anal fissures, but I just want to know if maybe something like this has happened to someone else who could give share. He doesn't have insurance right now, so thats why i'm asking on here! Thanks!