Pain:

Pain is an unpleasant sensory and emotional experience associated with actual or potential tissue damage, or described by the terms of such damage.

Nociception:

The process of detecting and signalling the presence of a painful stimulus in the peripheral and central nervous system.

MEANING OF DORSAL HORN OF SPINAL CORD IN NOCICEPTIVE TRANSMISSION 

MEANING OF PAIN

ACUTE PAIN

Important signalling mechanism

x

PATHOLOGICAL PAIN

Chronic (e.g. neuropathic) pain