It is my understanding that neuralgia is kind of a blanket a term used to describe nerve pain. Most of the folks I know who have suffered with it have had a very difficult time determining the cause, making it nearly impossible to cure. Mostly their treatment plan has consisted of pain management. On a positive note, my sister lived with occipital neuralgia pain for several years before finally finding a doctor who performed what at this point is an experimental procedure. It took care of the horrible pain once and for all. So there is some hope for your sister. Be there for her, support her, and don’t give up.