The hair is greasy and greasy, which gives people a dirty feeling of not loving cleanliness, but washing your hair every day is troublesome, and even the hair quality has become worse.
(Source: Network)
Why does someone else's washed hair last for two or three days, but their own hair is oiled so fast?
First, let's take a look at the principle of scalp oil.
Our scalp, like the skin elsewhere, is a complex ecosystem that contains a large number of skin appendages that secrete a variety of substances, including sebaceous glands, sweat glands, hair follicles, etc.
The sebaceous glands secrete oil, which is discharged to the surface of the scalp, and together with the lipids produced by the disintegration of keratinocytes on the surface of the scalp, the two are mixed to form "scalp oil".
The scalp secretes a certain amount of oil, which can ensure the moisture of the hair and make the hair shiny.
But if you secrete too much oil, your hair is easily greasy and it's easier to get dusty or something.
And if the oil plugs the pores of the scalp for a long time, it will also breed harmful bacteria, destroy the ecological balance of the scalp, induce dermatitis and even hair loss.
So to sum up, scalp oil is a normal thing, as long as it is cleaned regularly, but scalp oil secretion is not good.
There are several main reasons for the high secretion of oil and fat:
1. Heredity
The amount of oil secretion mainly depends on the unit density and sebaceous gland activity of different parts of the sebaceous glands, which are innately determined, and it depends on the contention of parents and mothers.
In addition, even if it is the same person, the secretion of oil in different parts of the scalp is also different. For example, usually, the forehead is higher than the top of the head and the back of the head, so the bangs are more likely to be oily [1].
2. Hormones
Hormones affect the secretion of scalp oil, which we often call androgenic alopecia (androgenic alopecia), which is usually accompanied by problems with excessive secretion of scalp oil (but oil production is not the cause of hair loss) [2].
Most people's hair loss problems belong to androgens, under the stimulation of male hormones, the scalp sebaceous glands increase in volume and secretion, resulting in hair follicle atrophy, hair growth period shortening and hair thinning problems.
3. Dysbacteriosis
If the ecological environment of facial skin is compared to a "plain", the scalp environment can be said to be a "tropical rainforest" of microorganisms.
The scalp provides a suitable environment for microorganisms to grow and a rich source of nutrients, and microorganisms can also help the scalp resist external damage and maintain environmental stability [3].
However, if you are sick, or if you are damaged by external forces, the scalp flora is out of balance, and the balanced ecology is destroyed, the sebaceous glands will be stimulated, resulting in abnormal oil secretion.
4. Diet and living habits
High-calorie foods (such as sweets, hot pots) will speed up the secretion of sebum, often stay up late or mental stress, but also aggravate the secretion of sebaceous glands.
(Source: giphy)
5. Disease
Increased sebum secretion is one of the important causes of acne and seborrheic dermatitis, and it is also an important manifestation.
In addition, seborrhea is common in neurological disorders such as Parkinson's disease, where sebaceous gland secretion levels can be up to twice as high as normal especially during disease progression [4], and increased sebum secretion occurs in some arteriosclerosis, diabetes mellitus, adrenal tumors, some breast cancer patients, and epilepsy patients [5].
1, quit smoking, quit drinking, eat more fruits, coarse grains, vegetables, less oil, less salt, less sugar, light diet, keep the spirit soothing, less stay up late will greatly reduce sebum secretion.
2, it is not recommended to use oil-controlled shampoo and various types of shampoo soap, such products are more alkaline, although the cleaning effect is very strong, but will be the normal sebum together to remove, change the scalp acid and alkaline environment, resulting in sebaceous glands secreting more oil, oil out faster and faster.
3. Control the frequency of shampooing, generally 2 to 3 times a week in spring and summer, and 1 to 2 times in autumn and winter. Frequent cleaning will reduce scalp oil, skin compensatory increase in oil secretion, making the local area more greasy, which will cause a vicious circle.
4. Ketoconazole lotion and selenium sulfide lotion can be used twice a week to wash the head, which can effectively remove the greasy scalp [6,7]. In addition, when some people use shampoos containing silicone oil (the ingredient list has "dimethicone"), they will find that their hair is easy to stick to strands and not fluffy enough. This is not because of the oil, but the silicone oil shampoo removes the static electricity between the hair in order to achieve a smooth effect. In this case, it is recommended to switch to a silicone-free shampoo.
5. If in addition to the simple scalp oil, the body has other discomforts (including but not limited to rashes, chest tightness and chest pain, dyspnea, stool trait changes, repeated diarrhea, etc.), at this time you may need to go to the hospital to check it out.
Finally, to sum up:
Scalp oil is a normal physiological reaction of the human body, and you don't have to wash your hair like crazy without a little oil.
If the scalp oil secretion is indeed too much, you can first improve your life, eating style, and try a brand shampoo.
However, if the scalp oil is suddenly excessive and other discomforts occur at the same time, go to the hospital as soon as possible for examination.
*The content of this article is a popularization of health knowledge and cannot be used as a specific diagnosis and treatment recommendation, nor is it a substitute for face-to-face consultation by a practicing physician, for reference only.
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