An sensation of discomfort or hurt in one part of the body due to bodily injury or disease (physical), or nervous system dysfunction (functional).  

Physical pain

Crushing, tearing, and penetrating are some of the injuries to soft and bone tissue that can result in pain.

Functional pain 

Sensation of pain in the absence of a physical cause -- "it's in your head".

Acute

Chronic

Nociceptive

Automonic

PAIN PATHWAYS: Pain is transmitted from peripheral receptors along peripheral nerves to the central nervous system (spinal cord and then brain) along a complicated pathways of neurons and neuronal processes (axons and dendrites).

Control of pain:

Receptors

Spinal cord

Brain

Back pain

Functional neurosurgery Specialty Center

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