If you aren't checking yourself then you may have a problem. For example you could have testicular cancer and you wouldn't know without feeling an unusual bump in that area.
Narcotics are also called opioid pain relievers. They are only used for pain that is severe and is not helped by other types of painkillers. When used carefully and under a health care provider's direct care, these drugs can be effective at reducing pain.
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Listening to music during exercise could lead to a better workout, scientists say. ... Listening to music while exercising can release feel-good chemicals in the brain — such as dopamine and opioids — that may boost your mood, dull pain and make you less tired, scientists say.
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You could check the Google for that
