yikes
While it's probably flat out harsh to say "his fault" then, ignoring that for a year is a really, really silly thing to do.
You don't know what he was experiencing though. Blood can be attributed to many things, such as haemorrhoids, tears in skin near your bunghole (fissures from straining). I believe the darker and blacker the blood (like lumpy clots) the more obvious a serious issue is.
Anyone can get intestinal polyps, which are basically like a wart on a stalk dangling from the internal surface of your large intestine. Usually from a few things such as:
- Hereditary
- Alcohol and Nicotene
- Too much red meat
- Not enough fibre
- Other conditions (Crohns)
These polyps are pre-cancerous, which means they are similar to a Stomach Ulcer or Moles and Rodent Ulcer on your face - they have the extremely high potential to turn nasty.