Can deep brain stimulation solve the mystery of pain?

Chronic pain is any pain that lasts longer than three months. It can also be inconsistent, a constant ache or sudden flares. The main problem in solving it is that there are many different causes, including arthritis, back pain, cancer, fibromyalgia, headaches, neck and nerve pain.  A new study funded by the NIH at the University of California, San Francisco, is trying to solve some aspects of chronic pain with deep brain stimulation, or DBS.