Referred pain refers to pain in the skin due to visceral sensation. Which term best describes this phenomenon?

• A. Nociception
• B. Hyperalgesia
• C. Allodynia
• D. Referred pain

Answer: (D)

Understanding how visceral signals can be felt on the skin helps explain this phenomenon. Referred pain occurs because nerves from internal organs and from the skin send signals to the same spinal neurons. The brain can’t distinguish the true source and interprets the signal as coming from the skin, so you feel pain at a skin location rather than at the organ. That’s why heart or stomach problems can produce chest or shoulder or arm pain even though the issue is internal.

Nociception is about detecting harmful stimuli, not where the sensation is located. Hyperalgesia is an increased pain response to a painful stimulus. Allodynia is pain evoked by stimuli that don’t normally provoke pain. These terms describe sensitivity or detection, not the mislocalization of visceral pain to the skin.