viscerally

This term describes a reaction that bypasses the rational mind, evoking a raw, instinctive response. It is often used to describe intense emotional states—such as horror, disgust, or profound joy—that manifest as physical sensations in the body. In a psychological context, it suggests a truth or feeling that is felt "in the gut" rather than concluded through logic.

In a medical or anatomical context, the word refers specifically to the internal organs (the viscera). While the emotional usage is far more common in general discourse, the anatomical usage remains precise and technical, describing sensations or processes occurring within the abdominal or thoracic cavities.