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How does a painkiller work?

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Quick answer

A painkiller works by interrupting the pain signals your body sends to your brain. Some block the chemicals that flag injury at the source, while others act in the brain and spinal cord to dull how strongly pain is felt.

Step by step

  1. Pain is a signal sent from an injury to the brain.
  2. Drugs like ibuprofen block the chemicals that trigger pain at the site.
  3. Opioids act on the brain and spinal cord to reduce pain perception.
  4. Some reduce inflammation, easing the cause as well as the signal.
  5. Different painkillers suit different kinds and strengths of pain.

People also ask

How do painkillers stop pain?
Either by blocking the chemicals that signal injury where it happens, or by acting on the brain and spinal cord to dull how pain is perceived.
How is ibuprofen different from opioids?
Ibuprofen reduces inflammation and pain signals at the source; opioids work in the nervous system to lower pain perception and are far stronger and riskier.
Why don't painkillers fix the injury?
Most only quiet the pain signal or inflammation; the underlying damage still has to heal on its own.