Does Nose Picking Increase the Risk of Alzheimer’s?—Shocking New Research

Nose picking, a seemingly trivial habit, being linked with Alzheimer’s disease may sound unbelievable. Yet, a recent study by Griffith University in Australia has brought this idea into serious discussion. While the research was conducted not on humans, but on mice, the findings raise questions that compel us to reconsider our understanding.

The study found that a bacterium called Chlamydia pneumoniae can reach the brain directly through the olfactory nerve if there is damage to the nasal tissue. Notably, this same bacterium has previously been detected in the brains of many people with dementia. When the lining of the mice’s noses is damaged, the infection spreads even faster—with the bacteria reaching the brain in just 24 to 72 hours and producing Alzheimer’s-like symptoms.

In response to the infection, the mice’s brains released amyloid-beta protein, which then clumps together. In humans with Alzheimer’s disease, abnormal buildup of this protein has long been regarded as a defining feature of the illness. Yet the question remains—Is this the cause of the disease, or is it a natural defense mechanism against infection?

The lead neuroscientist of the research team, James St John, stated that this is the first evidence showing that bacteria can directly enter the brain via the nasal route and may be capable of triggering Alzheimer’s. Their biggest surprise was the speed of infection—the bacteria spread to the central nervous system remarkably quickly. According to the scientists, the nose might be the fastest and most effective gateway for microbes to enter the brain.

Nonetheless, caution is necessary. This evidence so far is limited to mice—it is not yet certain whether the same process occurs in humans. Similarly, there is still uncertainty about whether amyloid-beta buildup is a cause or a reaction to the disease.

In our society, nose picking is often a topic of humor. In reality, however, 9 out of 10 people engage in this habit at some point in their lives. Even many animals exhibit this behavior. Why it is so common remains unknown. But if science suggests that this habit carries a serious neurological risk, then it certainly deserves attention.

Scientists are now planning to conduct similar research on humans. Until then, they advise to avoid picking your nose or plucking nasal hairs, as these actions can injure the inner lining of the nose and make it easier for microbes to enter.

Alzheimer’s is an extremely complex disease. Not just age—environment, diet, viruses, and bacteria can all play a role. Although risk increases after 65, scientists argue that infection-related causes should not be ignored.

There is no need for the general public to panic, but raising awareness is crucial. The body’s immune system is delicate—even a minor injury or seemingly harmless habit can sometimes set off bigger problems. That’s why any new scientific findings should be taken seriously.

In countries like Bangladesh, where awareness of neurological diseases is limited, research like this can serve as an important warning. Small lifestyle changes can help prevent major dangers. As there remains no cure for Alzheimer’s, prevention remains our greatest hope. And this research shows that even a common habit like nose picking can become part of the conversation about neurological diseases.