How do aspirin or other pain relievers work to ease pain?

How do they know what hurts and direct the aspirin there?

Its not that they know where to target the pain. NSAIDs enter your bloodstream within 20-30 minutes, thus circulating the medication throughout your body. Also, ibuprofin does not alleviate pain per se. What happens in the case of inflammation, the pain is caused by the inflammed area, the ibuprofin targets inflammation, and once the inflammation is gone, the pain dissipates. They are not actually considered pain pills contrary to most peoples' beliefs.

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aspirin thins the blood around a particular area and thus eases the tension on the blood vessels surrounding the area.
advil and other NSAIDS decrease pain by decreasing the swelling and inflammation around the painful area.
many of them also alter the chemical message sent to the brain

Aspirin slows the production of prostaglandins, which produces pain, fever, and inflammation. The aspirin basically kick starts the body's natural response.

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