Sensing without nerves

Some people who don't have the typical nerve endings in the skin to sense pain, heat, and pressure seem to be able to live a fairly normal life. That's because a second sensory system is in play. It turns out the nerves in blood vessels and sweat glands that we thought only regulated things actually contribute to sensation. This may be the mechanism involved in unexplainable pain conditions like migraines and fibromyalgia.