What if a disease could be detected years before symptoms-- not by tests, but by smell? This is exactly what happened with Joy Milne, whose unusual ability changed how scientists think about diagnosis.
Joy Milne, a retired nurse from Scotland, first noticed a strange, musky odor on her husband years before he was diagnosed with Parkinson’s disease. At the time, she didn’t realize it meant anything-- until she began noticing the same scent in other patients.
Scientists decided to test her ability. In a controlled experiment, she was asked to smell T-shirts worn by people with and without Parkinson’s. She correctly identified all affected individuals-- and even flagged one healthy person who was later diagnosed with the disease.
Researchers then discovered that Parkinson’s may alter chemical in skin oil (sebum) creating a distinct smell. This led to the development of experimental skin swab tests that could help diagnose the disease much earlier than current methods.
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