Control any bleeding.
Apply ice to the injured area to ease pain and reduce swelling.
Remove any jewelry right away. ...
Support a deformed hand on a pillow.
Take an over-the-counter pain reliever like acetaminophen or ibuprofen.
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I really suggest you go to a doctor if you have broken your arm. Failing to do so can result in your arm being in more pain and it could heal the bone wrong.
