A habit that is shared by thousands of people around the world and that, at a social level, is considered bad manners, is picking your nose.

Whether due to itching, discomfort or a simple habit that, in some cases, has been carried over since childhood, itching the nose is a habit highly related to dirt and lack of education.

However, this custom goes beyond being socially unpleasant in the sight of others, since medical experts classify it as risky for health.

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Why is picking your nose dangerous for your health? 
In addition to possible bacterial infections, constant bleeding, facial pain and damage to bone structure, studies have revealed that pick your nose —rhinotilexomaniaas it is known medically— It is a habit related to early dementia, that is, the Alzheimer's. 
The team of researchers from the University of Western Sydney, in Australia, suggests, based on their studies, that the habit of constantly picking our nose could have serious consequences for our brain. 
This is how Alzheimer's could come through the nose
And the study is based on the fact that, By inserting our fingers into our nose, pathogens such as viruses and bacteria gain a more direct route to our nervous system through the olfactory system.which is located in the nasal cavity and connects directly to certain areas of the brain such as the hippocampus.
These areas of the brain are the main ones to be affected by the hippocampus. 
Taking the above into account, scientists highlight that this process, which comes from the simple habit of picking the nose, could trigger—or accelerate—neuroinflammation, an immune response involved in the pathogenesis of Alzheimer's.

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This hypothesis of the relationship between rhinotilexomania and Azheimer's is not new, since—according to the DW portal—, It was first mentioned in 1992; However, it was not until years later that it became more important thanks to various studies. 
For its part, the portal Biomoleculeshighlights that rhinotilexomania could put the defensive barrier of the nasal microbiome at risk, which would facilitate the entry of pathogens into the brain, which, in addition to infections, could lead to severe infections.