Inflammation and irritation in the anal canal can cause hemorrhoids to swell up, causing a range of symptoms including localized pain, itching, burning and difficulty passing gas or stool. There are two types of hemorrhoids: external and internal. External hemorrhoids are typically painless, unless blood clots have formed in the area, in which case they will be very tender and painful to the touch. Signs of internal hemorrhoids include blood in the stool, or on toilet paper. Treatment typically includes the use of suppositories or topical creams aimed at reducing irritation and inflammation. Immersion of the anal canal in lukewarm water may also ease pain, and non-steroidal anti-inflammatory drugs (NSAIDs) may also benefit. Typically, hemorrhoids resolve on their own within a few days, but severe cases may require additional medical interventions, including possible surgery.