An anal fissure is a tiny tear in the lining of the anus, but the pain it causes is outsized—sharp, burning, and impossible to ignore. Severe pain during stool is the hallmark. It feels like passing broken glass and can last several minutes to hours afterward. Bright-red blood on the paper is common. You see a few streaks, but the bowl water stays clear. Burning and itching follow. The tear stings and itches as it tries to heal, especially when sweat or soap touches it. Spasm cramps the muscle. A deep, throbbing ache can linger, making it hard to sit... Learn more