physical or emotional suffering and discomfort caused by illness or injury. Pain can be classified based on pain physiology, intensity, time course, type of tissue affected, and syndromes. Physiologically, for example, pain could be nociceptive (from Latin nocere 'to harm or hurt') including mechanical (e.g., pinched skin), thermal (burn) and chemical (iodine in a cut, chili powder in the eyes, lactic acid in muscles); neuropathic (neuralgia, nerve trauma) and inflammatory (e.g. from repetitive strain).
