Ultraviolet rays make you lose your hair! Hair sunscreen must learn 2 strokes to prevent hair loss.

On sunny days, Gao tends to turn red in the sun, and many freckles are particularly prone to appear near her cheekbones. Do you always wear thick sunscreen before you dare to go out? Protect your skin, and expose your hair and scalp to the bright sunshine defenseless. Strong ultraviolet rays will not only sunburn the hair, but also lead to baldness! What is the ultraviolet index? Ultraviolet index (UVI) is often seen in weather forecast. What do these figures mean? The ultraviolet index predicted by the Meteorological Bureau refers to the maximum radiation intensity around noon. Uvi 0 ~ 2, you can go out without sun protection, you need to wear sunglasses and hats when you go out. Uvi 6 ~ 7, you will get sunburned within 30 minutes. In addition to sunglasses and hats, you need to wear sunscreen, or wear long-sleeved clothes and umbrellas. Stay in the shade as much as possible at Uvi 8 ~ 10, and you will get sunburned within 20 minutes. Above UVI 10, you will get sunburned if you are exposed to the sun for 10 minutes. As long as the UV index exceeds 8, you should avoid going out from the early morning of 10 to 2 pm and try to stay indoors. What harm can ultraviolet rays do to hair? The intensity of ultraviolet rays will change with the sunshine time, the distance from the earth and the altitude angle of the sun, and the amount of radiation reaching the ground will be attenuated by the absorption, scattering and reflection of the earth's atmosphere. Central weather bureau mentioned that the strongest period of ultraviolet intensity in the northern hemisphere is usually from June to August, and the weakest period is1February-February. According to the geographical location, the closer to the equator, the higher the ultraviolet intensity. In addition, factors such as ozone layer thickness, cloud cover and air pollution will also affect the radiation intensity. According to the wavelength of ultraviolet light, it can be mainly divided into UVA and UVB. Qing Yu Shangmei, a Japanese beauty consultant, mentioned that UVA accounts for 95% of ultraviolet rays, which will not only affect the superficial skin, but also penetrate deep into the bottom of the skin, destroy collagen and elastin, reduce the elasticity of the skin, and easily form wrinkles and relaxation. UVB will be absorbed by the ozone layer and clouds, so that UVB reaching the ground only accounts for 5% of ultraviolet rays, and it will also cause redness, inflammation or pigmentation on the epidermis, forming liver spots or freckles, and it will also make the hair sunburned, rough and dry, and easy to split and break. Qing Yu Shangmei even mentioned that UVA will reach the dermis of the scalp, causing damage to the whole scalp, which will not only destroy scalp cells, but also worsen blood and lymphatic circulation, unable to transfer nutrients to the hair roots, accumulate old wastes and inflammatory substances, and make it difficult to generate new hair, leading to excessive hair loss or baldness. How to prevent hair loss caused by ultraviolet rays? Using hair sunscreen spray or wearing a hat to block ultraviolet rays can be divided into SPF and PA. What is the difference? Qing Yu Shangmei mentioned that SPF can prevent UVB and PA can prevent UVA. The larger the value, the better the sunscreen effect. Basically, a high-value sunscreen spray can achieve the effect of chemical sunscreen only once a day, but it is necessary to measure the time and sweating in the sun and adjust it randomly, while wearing a hat can achieve the effect of physical sunscreen. If the roots of hair can't absorb complete nutrition, they will stumble, and it will be more difficult to generate new hair, so it is very important to improve the blood and lymphatic circulation of the head. Qing Yu Shangmei mentioned that the head is covered by a lot of fascia, so the whole * * * of the head can alleviate the adhesion of fascia, and the way of pulling out the ears or letting the shoulders rise and relax will help promote the blood and lymphatic circulation of the head.