why does my pee smell like popcorn

Rare disorder known as maple syrup urine disease can cause urine to have a popcorn-like odor (MSUD). The inability to properly metabolize specific amino acids is a hereditary condition known as MSUD. The result may be a urine scent reminiscent to maple syrup. For a thorough medical checkup and diagnosis of MSUD and other problems, see a doctor.