EVERYDAY SCIENCE

Detailed explanation-1: -Chronic or persistent pain is pain that carries on for longer than 12 weeks despite medication or treatment. Most people get back to normal after pain following an injury or operation. But sometimes the pain carries on for longer or comes on without any history of an injury or operation.

Detailed explanation-2: -“Fast pain”, which goes away fairly quickly, comes from the stimulation and transmission of nerve impulses over A delta fibres, while “slow pain”, which persists longer, comes from stimulation and transmission over non-myelinated C fibres.

Detailed explanation-3: -Pain caused by a needle, pin prick, skin cut, etc.-elicits a sharp, pricking quality, stinging pain sensation carried fast by the A delta fibers. The pain is precisely localized and of short duration. Pricking pain is also called fast pain, first pain or sensory pain.

Detailed explanation-4: -Acute pain usually comes on suddenly and is caused by something specific. It is sharp in quality. Acute pain usually doesn’t last longer than six months. It goes away when there is no longer an underlying cause for the pain.