What causes anal pain in the middle of the night?

Anal pain in the middle of the night, may be caused by hemorrhoids. Especially internal hemorrhoids mole nucleus constantly increase, the surrounding rectal mucosa stimulation, resulting in pain symptoms. Need to be treated under the guidance of a doctor topical anti-inflammatory ointment, serious need to consider surgery. In addition, there may be perianal abscess caused. Mainly due to acute inflammatory lesions at the end of the rectum, causing edema, ulcers and pus, and eventually cause local tissue pain symptoms. This condition requires surgery to be considered, and drug treatment is generally ineffective.