I have chronic pain. I have had chronic pain since I was at least in my teen years. The primary cause of my pain is hypermobility syndrome. In simple English, it means I am so flexible that it causes my joints to be in pain and constantly swollen on some level. The areas on my body that cause the most pain (in no particular order) are my lower back and hips. The most unstable joints in my body (in no particular order) are my knees, ankles, and elbows.