Pain can be difficult to diagnose for most doctors, as pain thresholds could vary. However, there is no ambiguity in the definition of chronic pain. Chronic pain is defined as pain that persists for 12 weeks. It can vary from sharp, dull, aching, or burning sensation in affected areas. The intervals of pain experienced can be steady or intermittent, or coming and going for no apparent reason. https://sites.google.com/site/drkarljawharireviews/blog/when-is-pain-considered-chronic-and-what-causes-it