- Related to local or repetitive trauma; Can also arise from multi-factorial and other contributors
- Can co-mingle w/other chronic pain problems, depression, fatigue
- Regional pain syndrome with a hyper-irritable spot that serves as a trigger point within muscle
- Touching trigger point causes reproduction of pain
- Touching specific spots in muscle causes pain
- Often palpable taut/hardened band of muscle at trigger point, w/palpation causing pain
- Can have decreased range of motion of involved muscle
- No overt joint or other pathology identifiable