Almost 90 percent of patients with Parkinson’s disease have no sense of smell, so the loss of smell can be called an early symptom of this incurable disease,
A common recollection by people who are diagnosed with Parkinson’s is that they remember changes in their sense of smell several years before developing any tremor or other movement problems.
Studies have shown that the pre-motor phase (the time before motor symptoms appear) lasts around five years or more, and it has been estimated that in some cases, smell loss may occur up to 10 years before Parkinson’s is diagnosed.
Doctors cannot yet cure the disease, but they can significantly improve the quality of life of patients, as well as slow down the progression of the disease.
Loss of smell is the most common and most visible sign of COVID in patients, NEWS.ru reported earlier.