Mouth ulcers, also known as canker sores, is an autoimmune disease. One of its characters is continuous onsets. Once I suffered from Mouth ulcers. It was very painful when it shew effect, especially when I ate and spoke. Also, my life and study were impacted by this disease. Really miserable experience. I had tried all kind of methods of western medicine and TCM medicine, but none of them could cure once and for all. After I learned that Qigong can improve human’s Immune function, I tried it. What I practiced was the six-character formula (Liu Zi Jue) and meditation. It surprised me that it did a miracle on me – the times Mouth ulcers shew effect was reduced, and the degree of suffering was lighter. It finally was healed. It has been 2 years now and Mouth ulcers very seldom show effect. it occurs occasionally, but I don’t feel pain and it usually heals up very quickly.