What type of arthritis is characterized by significant pain in 11 or more pressure points?

The type of arthritis characterized by significant pain in 11 or more pressure points is indeed associated with fibromyalgia. This condition is not classified as a traditional form of arthritis but falls under the category of chronic pain syndromes. Fibromyalgia is characterized by widespread musculoskeletal pain accompanied by fatigue, sleep, memory, and mood issues. A key diagnostic feature of fibromyalgia is the presence of tender points, which are specific sites on the body where pressure can trigger pain, and having significant pain in 11 or more of these pressure points is a major criterion for its diagnosis.

In contrast, rheumatoid arthritis, reactive arthritis, and ankylosing spondylitis primarily involve joint inflammation and various systemic symptoms, but they do not focus on the tender point criteria used in diagnosing fibromyalgia. Each of those conditions has distinct pathophysiology and clinical presentations that differ from the widespread pain and tenderness seen in fibromyalgia.