A persistent, fish-like body odor, even after bathing, could indicate the rare metabolic disorder Trimethylaminuria, also known as fish odor syndrome. This condition prevents the body from properly breaking down trimethylamine, a chemical compound found in certain foods. The buildup of trimethylamine then causes a distinct, unpleasant odor released through sweat, urine, and breath. While uncommon, the syndrome can significantly impact a person’s quality of life due to social stigma. Diagnosis typically involves analyzing urine samples for elevated trimethylamine levels. Further research is ongoing to understand the genetic factors contributing to the condition and explore potential management strategies.