The Human Brain

I was wondering whether there's a disease that creates pain artificially. The Human mind is the most complex object and a slight malfunction can create diseases such as depression, split personality, and obsessive-compulsive disorder. Malfunctions have even created psychos and supermen. The traits of each brain are so varied - Some are overenthusiastic, some are dull and bored, intelligence varies in a very big range among people. Some like Mahatma Gandhi have enough power to say "Hey Ram" even while experiencing the pain of death and some like Don Corleone say "Life is beautiful" at their deathbed. Some of them fight wars for nations, though they know they will die any moment and some never give up while some of them are real big losers. All this happens because of certain parameters that vary in the anatomy of each individual brain. Likewise, I was wondering if there's a part of the human brain thats responsible for processing and sending out signals that create the sensation of pain and if there's a malfunction in this region, will the affected feel pain for no reason at all? Maybe feel the same pain that one feels while getting beaten even though there is no external pain- inducing agent. Does such a disease already exist? If its possible to pin-point the brain tissue responsible for this, is it also possible to suppress it such that no pain is felt even when damage is inflicted. I guess analgesics do this job petty well. The brain is weird. Now, don’t say that I am weird.