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You might be suffering from piles / hemmorhoids. Due to constipation
, when a person strains there is pressure and piles get worsen.As the piles grow pain increases , which causes more constipation again.This cycle continues.So it is necessary to treat constipation with laxatives and piles can be reduced by reducing pain and soft diet
.If in worse case surgery is done.You may use Lignocaine jelly at anus to ease your pain only under medical supervision.