Why a hit below the belt can make you nauseous

The male anatomy has a massive evolutionary design flaw. Testicles are densely packed with nociceptors and share nerve pathways with the stomach and vomiting centers of the brain. A direct hit sends an overwhelming shockwave of visceral pain that causes instant nausea, a dramatic drop in blood pressure, and a level of agonizing distress that neurologists equate to the early stages of cervical dilation.