But have you noticed that everyone's gray hair seems to have its own unique place, either on the forehead, on the temples, or on the back of the head, this is not accidental, but a reflection of some internal changes in the body.
The appearance of these gray hairs not only affects our appearance and reduces our appearance, but more importantly, it increases our psychological burden.
Traditional Chinese medicine theories believe that hair is closely linked to physical health, and that gray hair is not for no reason, in addition to the well-known aging factors, gray hair in different locations may indicate different problems in the body. Therefore, when you find your gray hair, you may wish to check this information to see if there is a problem with your body, detect it early, and condition it as soon as possible, which may be able to better maintain your health and delay the pace of aging. 
Heredity
Genetic factors play an important role in the formation of gray hair, some people may start to develop gray hair at a young age, which may be related to family inheritance, in this case, the appearance of gray hair is not due to some disease, but the expression of inherited genes.
Age
Secondly, as we age, the function of hair follicles gradually decreases, and the production of melanin decreases, resulting in gray hair, which is a normal physiological phenomenon and not a sign of some kind of disease.
Malnutrition, life stress, environmental factors
In addition, malnutrition, life stress, environmental factors, etc., may also cause gray hair to appear early. For example, deficiencies in certain nutrients, prolonged exposure to harmful environments, and long-term exposure to high stress can all have a negative impact on hair health, leading to an increase in gray hair.
There are various claims about gray hair circulating on the Internet, and there are even articles claiming that "long gray hair can reduce the risk of cancer", and also citing relevant research from Harvard University as a basis.
However, is this view true or false? After some tracing back to the source, I found that there is actually some controversy on this issue.
The study, which "long gray hair may reduce the risk of cancer," first appeared in 2009 as an experiment done by Japanese researchers that focused on melanocytes in hair follicles.
Studies have found that when these stem cells are damaged by DNA, they do not die, but rather mature gradually, leading to stem cell depletion.
Interestingly, mature melanocytes are unable to continue producing melanin, so over time, the mice's hair gradually turns gray and white, and the researchers believe that the mechanism of human hair whitening is similar to that of mice.
However, in his interpretation of the study, Professor David Fisher of the Harvard** Department of the Department of Science and Technology pointed out that if melanocytes do not transform into melanocytes after DNA damage, but instead exist in the form of stem cells, then they may continue to produce melanin, thereby increasing the risk of cancer.
Professor David's view itself is correct, but when it was reported by **, it was misinterpreted as "graying hair is a sign of a reduced risk of cancer", which undoubtedly caused a misunderstanding.
In fact, Professor David is emphasizing the impact of melanocytes on the human body by "surviving as stem cells" and "transforming into melanocytes", rather than comparing the cancer risk of people with black hair and white hair.
Therefore, we cannot simply equate gray hair with a reduced risk of cancer. In addition, if growing gray hair does reduce the risk of cancer, then older people should be more susceptible to cancer. However, the reality is that the risk of cancer is higher in older people.
Therefore, we cannot easily believe the various legends and opinions about gray hair on the Internet.
In our daily life, we often hear such a sentence: "Where the gray hair grows, where the disease appears?" Although this sentence may seem simple, it contains a wealth of scientific evidence.
In fact, hair color is determined by melanocytes in hair follicles, which also affect our health.
Every hair grows in hair follicles, and these hair follicles are hidden deep under the scalp, and in each hair follicle there is a group of pigment cells that are responsible for the production of melanin, also known as pigment, which provides color to our hair and also influences our health to some extent.
So, why is "where gray hair grows, where is the disease?" "What? This is because the pigment cells in different hair follicles respond differently to different diseases.
Forehead
The growth of a large number of gray hairs on the forehead is usually caused by a disorder of the spleen and stomach, which in TCM theory belongs to the Yang Ming area, which has a close relationship with the spleen and stomach.
When Yang Ming is weakened, the hair will gradually turn white, which is actually a signal of problems with the spleen and stomach, and the forehead corresponds to the reflex area of the spleen and stomach in traditional Chinese medicine, and when the body has this symptom, we should pay close attention to it.
In the "Yellow Emperor's Neijing", there is a discussion on the relationship between the forehead gray hair and spleen and stomach disorders, and the book points out that the long white hair on the forehead is a reminder from the body that we need to regulate the spleen and stomach as soon as possible to ensure good health.
Once the spleen and stomach are out of balance, it will affect nutrient absorption, resulting in a lack of qi and blood, which in turn affects hair growth and color.
Sideburns
In daily life, we will notice that some young people prematurely develop gray temples, which not only affects the image of the individual, but also suggests that there may be problems with physical health, in fact, the occurrence of this situation is closely related to liver function.
The color of the hair in the temple area can reflect the health of the liver to some extent, and the liver plays a vital role in the human body and is the main detoxification organ in the body.
Once the liver function is abnormal, it may lead to the accumulation of toxins in the body, which in turn can lead to a series of physical discomfort symptoms, such as anxiety and irritability.
Traditional Chinese medicine theory believes that the two temples correspond to the liver and gallbladder in the five internal organs, if there is a problem here, it will often lead to the growth of gray hair on the temples, when the two temples appear gray hair, we should be aware that this is a signal that the liver needs to be regulated.
The back of the head
As an important part of our body, the back of the head is not only a support point for the head, but also a reflex area for kidney qi in our body. In the theory of traditional Chinese medicine, whether the kidney qi is sufficient or not directly affects a person's overall health, and if there is a large amount of gray hair on the back of the head, it may be a sign of insufficient kidney qi.
The impact of kidney qi deficiency on the human body is all-encompassing, and it may affect our growth and development, resulting in abnormalities in height, bone development, etc.
At the same time, the lack of kidney qi may also affect reproductive function, leading to problems such as decreased fertility. In addition, the lack of kidney qi can also affect our immune system, making the body less resistant and more susceptible to diseases.
In the face of the problem of kidney qi deficiency, we should not take it lightly, pay attention to a reasonable diet, supplement enough nutrients, especially foods that are beneficial to the kidneys, such as black beans, black sesame seeds, etc. Secondly, it is necessary to develop good living habits, ensure adequate sleep time, and avoid overwork and stress.
White hair can be plucked, but it is not recommended to pluck it.
Because pulling out gray hair does not solve the root cause of the problem, but may cause some unnecessary health problems.
Frequent plucking of gray hair can cause damage to the scalp and increase the risk of infection, and frequent plucking of gray hair can irritate the hair follicles, trigger inflammation, and even lead to permanent hair loss, so there should be other ways to relieve the problem of gray hair.
Adjust your mental state
Long-term stress and stress may promote the formation of gray hair, so try to keep your mind relaxed and participate in outdoor physical exercise in moderation to relieve stress.
Massage the Taixi acupoint
Taixi acupoint is located in the ankle area, massaging this acupoint can promote the supply of nutrients to the hair, make the hair more elastic, gently press and rub the Taixi acupoint with your thumb for about two minutes every day, repeat three times, and you can see a certain effect if you stick to it for a long time.
Foot pedaling
By stepping your feet on uneven objects, such as gym slippers, gym blankets or cobblestone roads, you can stimulate your feet, promote blood circulation and metabolism, and help improve gray hair.
Black sesame seeds
Black sesame seeds are rich in tyrosinase, an enzyme that promotes the synthesis of melanin, so eating black sesame seeds regularly can help prevent gray hair.
Capsule
Capsule's cabbage is rich in protein, carotene, crude fiber, vitamins, and a variety of minerals, which are very important for hair health and can prevent gray hair.
Lion's mane mushroom
Lion's mane mushroom has a high protein content and is rich in vitamins and minerals, which can promote hair growth and prevent gray hair.
Royal jelly
The nutrients in royal jelly can accelerate the synthesis of melanin in the scalp and body, so that melanin particles are quickly transported to the hair follicles, thereby preventing gray hair.
Overnight whitehead refers to the phenomenon of some people experiencing a large amount of gray hair in a short period of time, which is usually caused by emotional factors such as extreme sadness, worry, and panic.
When these emotional factors stimulate the hair follicles of the scalp, the melanocytes in the hair follicles suddenly stop or decrease the secretion of melanin, so that the new hair does not get sufficient pigmentation, resulting in a large number of gray hairs.
The exact cause of an overnight whitehead is not fully understood, but what is certain is that the change is instantaneous and usually does not affect physical health.
Studies have shown that this change may be related to the body's stress response, when the body is in a state of extreme tension, it releases a large number of stress hormones, which affect the function of melanocytes inside the hair follicle, resulting in reduced pigmentation and overnight whiteheads.