An atypical symptom may be a sign of Parkinson's disease

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Parkinson's disease is a slowly progressive chronic neurodegenerative disease. It causes the loss of cells in the part of the brain that is responsible for the production of dopamine.

The substance acts as an intermediary between the brain and the nervous system, which helps control and coordinate body movements. However, recently, experts discovered an unusual sign of the disease.

According to a study, 90% of people with Parkinson's disease lost their sense of smell. This condition is called hyposmia and is an early symptom of the disease. Scientists have noted that the loss of smell can occur 10 years before a person is diagnosed with Parkinson's disease.

It is at this time that the earliest changes in the brain can be detected. What exactly hyposmia is related to, scientists do not yet know for sure, but they assume that the disease process itself may begin in the olfactory bulb – the part of the brain that is responsible for it.

Other signs of the disease include tremors, uncontrolled movements during sleep, stiffness of limbs or slowness, voice changes. Currently, it is believed that the cause of this disease may be a combination of genetic changes and environmental factors.