Why can visceral organs be cut without causing pain in some cases?

Visceral organs can be cut without causing pain because tissues are not universally sensitive to all types of injury; instead, they respond primarily to the specific stimuli they are likely to encounter in their environment.1

While the skin is highly sensitive to cutting and burning, visceral organs generally lack the specific pain receptors necessary to register the mechanical trauma of a surgical incision. However, these organs are not entirely insensitive; they will generate pain in response to other specific stimuli, such as chemical irritation or overdistension. Some internal structures, such as the liver and the alveoli of the lungs, remain largely insensitive to almost any form of stimulation.1