Oily hair is the result of excessive sebum production by the sebaceous glands. Interestingly, this phenomenon could potentially be the cause of long-term hair loss. Is it true that an increased secretion of sebum can directly affect the hair growth cycle?
Oily Hair and Hair Loss: Is There a Connection?
- Oily Hair: What are the Causes?
- Oily Hair and Hair Loss: Does Excess Sebum Disrupt Hair Growth?
- How to prevent hyperseborrhea of the scalp?
Oily Hair: What are the Causes?
Oilyhairis due to an excess of sebum, referred to as hyperseborrhea, which can be caused by hormonal imbalance, stress, pollution, or poor diet.
The primary cause of this scalp imbalance is an increase in the production of androgen hormones. In men, the main androgen hormone is testosterone, while in women, it is Δ-4-androstenedione and dehydroepiandrosterone. Within the sebaceous cells, these androgen hormones are converted into testosterone by various enzymes. This testosterone is then transformed into dihydrotestosterone due to the action of an enzyme called 5-α-reductase, which stimulates the activity of the sebaceous glands. Therefore, individuals with highly active 5-α-reductase tend to be more prone to overproduction of sebum.
External factors can also be to blame, including pollution, UV rays, or unsuitable hair products that can harm the scalp and lead to over-stimulation of the sebaceous glands and the production of an excess of sebum to protect the scalp. Lastly, frequent consumption of high glycemic index foods results in a spike of insulin in the blood, which also triggers an increase in androgen levels, and thus indirectly causes excessive sebum secretion.
Oily Hair and Hair Loss: Does Excess Sebum Disrupt Hair Growth?
Oily hair is due to an excess of sebum (hyperseborrhea) which can be caused by hormonal imbalance, stress, pollution, or poor diet. Combined with sweat, sebum forms the hydrolipidic film that covers the entire surface of the skin. It helps to protect the corneal layer from dehydration by maintaining hygroscopic substances in the epidermal cells. Its role is to prevent hair from becoming dry and brittle.
Excess sebum gathers and accumulates in the follicular ducts thereby blocking the proper oxygenation of the hair, as well as its normal growth and development. Due to hyperseborrhea, hair becomes thinner, shorter, duller, and more fragile with each growth cycle. Indeed, this excessive production of sebum can lead to a progressively shorter anagen phase until the follicles die and the hair subsequently falls out.
Several studies have also mentioned that hyperseborrhea could exacerbate cases of baldness in women: FPHL (Female Pattern Hair Loss). Indeed, hyperseborrhea is linked to an increase in the production of androgen hormones. These lead to an acceleration of the hair cycle and the hair follicle renewal capital will prematurely deplete, inducing hair loss. This refers to hair loss that occurs in women suffering from androgenetic alopecia. Thus, in general, if excess sebum does not cause hair fall, it can nevertheless disrupt its growth and eventually generate alopecia or accentuate it if it is already present.
How to prevent hyperseborrhea of the scalp?
However, it is possible to prevent scalp hyperseborrhea with simple actions. We first suggest maintaining a regular hair care routine with gentle products that do not irritate the scalp. It is best to avoid washing your hair too frequently or using an excessive amount of shampoo, as this can damage the scalp's hydrolipidic film and stimulate sebum production. It is recommended to limit washes to a frequency of one shampoo every two days and alternate between a regular shampoo and a purifying treatment. Indeed, this type of treatment allows the scalp to be cleaned, sanitized, and purified. Clay is also a recommended active ingredient for oily hair as it helps absorb excess sebum. For this, you can apply a clay hair mask once a week.
Thus, through these actions, it is possible to regulate sebum production and limit hair loss associated with hyperseborrhea.
PIÉRARD G. E. & al. Women’s skin throughout lifetime. BioMed Research International (2014).