Could you walk around with abdominal trauma and internal organ injury without knowing? The question is whether all the involved parts can sense pain.

Trauma. Delayed diagnosis and missed injury with trauma is what drives the current care. Trauma systems perform primary then secondary then close monitoring and follow up to specifically catch missed and delayed presentations of injuries. Your internal organs do NOT have the same nerve sensation as your skin. Organs have pressure sensors and more rudimentary pain fibers. Be well.