The little toenail is split in half. Why? Is this related to health?

It is normal that the little toenail is divided into two halves, that is, the little toenail is divided into petals. Little toenails are small outside and big inside. After being cut off, new or two petals will grow, also called petal nails. So far, the etiology of petaloid nail is still inconclusive in academic circles, and the research based on genetics is also very rare.

Anthropological and ethnological views on petaloid nail are very mysterious. It is said that only Han people with pure blood are divided into two petals, and the outside one is smaller. According to the investigation and analysis of relevant personnel, petaloid nail is a heritable trait, which has nothing to do with sex. Some people were born without petaloid nails, the earliest appeared in 1 year, and the latest appeared after 5 years old. Not all children born to petal-shaped parents are petal-shaped nails. One parent has petal nails, some children have petal nails, and some don't. So, does toenail really represent the pure Han people? Kong Xiangdong, director of the Institute of Genetics of the First Affiliated Hospital of Zheng Da, said, "There is no such thing as pure Han nationality". In history, there were exchanges between the Han nationality and the Mongols, and there was also ethnic integration in the Hexi Corridor and the Silk Road. War and commerce are important driving forces of national integration, so there is no pure China descent.

In this regard, in 2005, Associate Professor Bian Jianchao, who worked in the School of Public Health of Fudan University at that time, led graduate students Hao Weiguo and others to conduct a special investigation on the genetics of petaloid nails. The final result shows that 63.74% people in Henan have cracked toenails, which proves that this is related to the legend of Sophora japonica in Hongtong County, that is, Shanxi immigrants.

In short, a split toenail doesn't mean anything. It has no dysfunction, so it has no natural selectivity, so it has been preserved for thousands of years. Cracked toenails are only a slight manifestation of toe deformity, so there is no need to worry about affecting human health.

Dr. Wu Yao Wu Yao is also very curious about this question. Although there is a "petaloid nail" in medicine, it has never given a scientific and reasonable explanation. Some theoretical inferences about "petal nails" are just inferences!

Interesting phenomenon

During the Hongwu period, Dr. Yao Yao's family moved from Sichuan to Yantai, Shandong Province to take root. It is said that all the people moved from Sichuan are "petal nails". Of course, I am a petaloid nail myself, but I never believe in any racial theory or genetic theory.

After the baby was born at home, I specially observed the baby's little toe and it didn't crack at all. In Beijing, you can get in touch with new parents who are far away at home and abroad. When the baby was walking, I also paid attention to the babies of all ages around me. Although the number of babies observed so far is very small and not statistically significant, I found an interesting phenomenon. Children under the age of 4 basically have no petal nails, while their parents basically have them.

Preliminary cause analysis

As early as 100 years ago, some people in Britain studied the problem of "petaloid nail", which is not unique to China people, so the racial problem was ruled out. Then some people will refute, could it be the temporal and spatial expression of genes such as gonadal development? No medicine, no medicine, the doctor thinks, impossible. The size of nails will be inherited by traits with the shape of fingers and palms, but these traits have been fully manifested at birth.

In-depth cause analysis

Excluding genetic and racial reasons, we have to analyze it from both adults and children. It is not difficult to find that children can hardly walk by themselves, and external forces can't hurt their little fingers. This is a very important reason.

Toes are on the outermost side and are easily squeezed by shoes. If squeezed for a long time, it is easy to cause nail cracking. As the saying goes, extrusion deformation. Therefore, people who often walk barefoot, on the contrary, there are even fewer cases of "petal nails". If the little toe is naturally less stressed, the incidence of "petal nail" is also less. I think that's why.

Of course, this needs more evidence to prove.

How to deal with

No medicine, no medicine, the doctor himself used to be torn by socks, bleeding and still hurting. From the above analysis, we know that in fact, everyone basically did not have "petaloid nails" when they were young, so this trait is not innate. When it cracks, cut off half of the crack and wrap it in a small band-aid. Band-AIDS are non-slip and wear-resistant, and should be replaced frequently until new nails grow. At this stage, try to wear shoes with loose feet. When the new nails grow out, you will find that the new nails are closed, but you still feel cracked. Full recovery requires a long period of protection. The above is Dr. Yao Yao's personal practice. At present, the nails have not cracked again.

Welcome to pay attention to Dr. Nuo's medicine without medicine!