Which statement about abdominal pain types is true?

• A. Referred Pain Is Always a Result of Nerve Irritation in the Spine.
• B. Parietal Pain Is Never Localized.
• C. Peritonitis Never Causes Fever.
• D. Visceral Pain Is Typically Diffuse and Dull, While Parietal Pain Is Severe and Localized.

Answer: (D)

Pain in the abdomen comes from two main sources: visceral and parietal (somatic) innervation. Visceral pain arises when an organ stretches, distends, or is irritated, and its nerve fibers travel with autonomic pathways that lead to poorly localized sensations. That makes visceral pain feel diffuse, vague, and sometimes crampy, and you might notice it in a broad area or refer it to other regions. Parietal pain comes from the parietal peritoneum, which has somatic nerves; those fibers provide precise localization, so the pain is sharp, severe, and well localized to a specific spot, often worse with movement or coughing. Peritonitis, inflammation of the peritoneum, usually brings fever and clinical signs like guarding, reinforcing that fever can accompany abdominal inflammation.

So the statement that visceral pain is typically diffuse and dull while parietal pain is severe and localized accurately describes how these pain types present. Referred pain isn’t strictly “nerve irritation in the spine” and can occur for other reasons, parietal pain can be localized, and peritonitis commonly can cause fever, making the other descriptions inconsistent with typical patterns.