A 52-year-old man comes to his primary care physician because of pain with defecation. The symptoms began 2 weeks ago. The pain is worse with straining, and the patient has occasionally noticed streaks of fresh blood on his stools. He works as a construction worker, and his diet consists mostly of fast food. His temperature is 37.3°C (99.1°F), blood pressure is 142/85 mmHg, and pulse is 73/min. Physical exam shows multiple purplish-blue sacs in the anal canal. Which of the following structures is most likely responsible for providing sensory innervation to the lesion site?

Hemorrhoid

Foundational SciencesPathologyGastrointestinal systemDisorders of the stomach, small intestine, colon, rectum, and anusRectum and anus

Organ SystemsGastrointestinal systemPathologyDisorders of the stomach, small intestine, colon, rectum, and anusRectum and anus

Definitions & Key takeaways

Hemorrhoids are inflamed and swollen veins in the rectum or anus. They may be caused by straining during a bowel movement, pregnancy, childbirth, or obesity. They can also be a result of prolonged sitting or standing. Symptoms include pain, itching, and bleeding.

Hemorrhoid

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