External factors that affect hair


Hair Cosmetics

Washing and styling can nourish hair and scalp - but they can also damage them. Washing your hair frequently can cause your scalp to dry out and lead to irritation, especially if the water is too hot, your shampoo is too aggressive, or you use alcohol-containing hair lotions, styling gels, or styling sprays that attack skin and hair.
The water temperature should be no higher than 35°C, while shampoos generally only need to be applied once and should then be washed out thoroughly after being given a few moments to work. Shampoo only needs to be applied twice if your hair is very dirty.

Perms and dyes put a huge amount of stress on the hair’s structure and can irritate the scalp. They should therefore not be used at the same time if at all possible. After perming or dying your hair, you should use a mild, nourishing shampoo, preferably for dry or damaged hair. Curling tongs, hood hair dryers, and regular hair dryers have a primarily negative effect, and to prevent your hair from breaking, becoming like straw, and splitting at the ends, your hair will require extra care after using one of these appliances as well.


The scalp and hair roots of those who have a normal diet are supplied with sufficient quantities of nutrients. 

While rare cases of malnutrition can trigger hair growth disorders that eventually lead to hair loss, hair loss is usually the result of other causes. 

There are no special diets that encourage the development of beautiful hair or prevent it from falling out.


Scalp and hair dry out in the cold, the heat, and when the humidity level is low. Hair loses its shine and becomes dull, straw-like, and difficult to comb. It also develops a static charge more easily. 

Scalp tightens and then begins to itch and flake. You are more like to suffer irritation.



UV rays from the sun don’t just bleach hair, they can also dry it out. Scalp often loses
moisture because of the sun as well, and can itch or flake. If you have light-coloured or thin hair, your scalp is more likely to sunburn.

Environmental pollutants
Air pollutants attack hair and scalp and can dry them out. This can cause irritation on the scalp with redness, itchiness, and burning, and also dandruff.


Stress can increase the skin’s sensitivity and hinder hair growth.


A person’s hair and scalp become drier as they get older. Their hair’s loss of colour and 
the emergence of grey hairs is the most obvious change, which occurs when the pigment
cells in the hair roots begin to stop producing melanin. Men can start to experience hormone
induced hair loss from their mid-twenties, which can then lead to balding. Younger women 
with hormone disorders and older women going through the menopause often lose hair 
because of the decrease in oestrogen production, but it rarely progresses to the extent it does in men.