QS Study

Pain is defined as an unpleasant sensation due to tissue damage. Pain is a protective mechanism. It is not just a bodily feeling. It is influenced by attitudes, beliefs, personality and social factors, and can affect emotional and mental well-being. You may feel pain in one area of your body, such as your back, abdomen, chest, pelvis, or you may feel pain all over.

Receptor – Free nerve ending.

Classification – Two types: Fast pain and slow pain.

Fast pain

  • Definition: The pain which is felt within 0.1 sec.
  • Also called: Sharp pain, pricking pain, acute pain,
  • Afferent nerve: Myelinated type A fiber,
  • Conduction velocity: 6-30 m/S,
  • Stimuli: Mechanical and thermal e.g. pinprick, burn,
  • Neurotransmitter: Glutamic acid,
  • Pathway: Neo spinothalamic tract.
  • Examples: pain from a surgical incision

Slow pain

  • Definition: The path which is felt after 1 sec or more.
  • Also called: Slow-burning pain, aching pain, throbbing pain, chronic pain.
  • Afferent nerve: Nonmyelinated C-type fiber.
  • Conduction velocity: 0.5 – 2 m/S.
  • Neurotransmitter: Substance P.
  • Pathway: Paleo spinothalamic tract
  • Examples: labor pain, pain starting after fast pain from an injury.

There are also three main categories of pain in the medical term: acute, chronic and cancer pain.

Acute pain lasts for a short time and occurs following surgery or trauma or other condition. Chronic pain lasts beyond the time expected for healing following surgery, trauma or other condition. Cancer pain can occur in patients with impulsive stage and advanced disease, and in cancer survivors as a severe and debilitating side-effect of treatment.