there are many reasons for an itchy and/or painful butt. worms (like pinworms) are only one of many causes. other causes including anal fissures (tiny tears along the anal ring) hemorrhoids skin tags and other skin conditions. rather than feel you have worms it would be best to see a medical provider so that you can be properly examined and lab tested if necessary.
my butt hurts when i poop and it itchs sometime would this be caused by worms