After seven years of no relief from fibromyalgia symptoms and in the care of a highly recommended rheumatologist, I was able to get an appointment with Dr. David Chang. Even before there were drugs targeted for fibromyalgia, he knew what I needed to,relieve the pain, fatigue, and sleepless nights. As other symptoms immerged he was able to provide help with the problem. My husband and I both see him for different ailments, but I can say without hesitance that he is the best internal medicine physical in the GHS system.