On the rare occasion I have a headache, I'll often reach for a Tylenol to help relieve the pain.
Usually this is relatively effective. Either it'll eliminate the pain completely or reduce it to a much more manageable level.
Yet, even under the effects of something like Tylenol or Ibuprofen, if I were to say, pinch my arm, I'd still feel essentially the same amount of pain as normal.
Is there a biochemical reason for this? Is there a difference between acute and chronic pain? Or is there perhaps some psychological component to it?
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I'm wondering if the salty air when near the ocean, or on a boat can dehydrate the human body faster than if you were away from the ocean. Also, what amount of concentration of salt is in the air that you're breathing. Many times I have found piles of salt in my bags, when on a long voyage on a boat. Thanks for the information anyone can give me!
Does it block one or the other? Are vitamin D and β-endorphin synthesis both mediated by the same spectrum of UV light?
Relevant paper on β-endorphin addiction to UV light:
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