Poor Sense Of Smell Is Sign Of Parkinson's

Armen Hareyan's picture

Poor sense of smell is supposed to be an early sign of developing Parkinson's disease.

Researchers from Kuakini Medical Center in Honolulu examined 2267 patients during eight years, who were taking regular olfactory testing. During the study period 35 men developed Parkinson's disease.


Researchers considered all other factors causing poor sense of smell, such as 'age, smoking, more coffee consumption, less frequent bowel movements, lower cognitive function and excessive daytime sleepiness'. They excluded these factors and accounted how olfactory affects Parkinson's disease. They found that those with poor sense of smell are 5 times more likely to develop the disease than the others.

Those detected with poor sense of smell developed the disease at least 4 years after the detection. Researchers estimate, that it can take from 2 to 7 years to develop Parkinson's after olfactory weakness detection.

Scientists are not sure how sense of smell can be linked to the disease. However, they suggest, that Lewy bodies occurring in nerve cells and nerve loss, which are the main damages among Parkinson's patients, may also cause sense of smell loss. Weakened sense of smell may also be caused by excess sniffing, so it may also be considered as early sign of Parkinson's disease.