What Are The Effects Of Solar Radiation On Health?

The health effects of solar radiation range from mild skin damage to the development of cancer or disorders in the immune system. So it is better to take the precautionary measures that we discuss in this article.

The sun, the star closest to Earth, has been the subject of poetry, dreams, but also studies. Its light allows the day to exist and warm us, thus stimulating the development of life. However, all is not rosy for this star since the effects of solar radiation on health are not always positive.

The energy transmitted by the sun is distributed in the form of radiation. But all the energy it produces does not reach Earth, as much of it is absorbed by the atmosphere. However, the radiation that reaches the surface is responsible for a variety of conditions ranging from sunstroke to skin cancer.

What is solar radiation?

The radiation produced by the sun is of several types. However, two of them are the most incidental. First of all, there is infrared radiation which is low in energy intensity and has low power to penetrate through the skin.

Therefore, this type of radiation is generally not responsible for skin problems. In addition, it produces a feeling of heat and stimulates blood circulation while promoting thermoregulation and causing sweating.

Then there is the ultraviolet (UV) radiation, which is of lesser range for the Earth, but with a great capacity to penetrate the inner layers of the skin. Depending on the type of UV radiation in question, it can simply lead to a more or less intense tan, or even cause lesions.

The sun and human health

Although sun exposure promotes processes such as the synthesis of vitamin D, too much can be harmful to health. The World Health Organization (WHO) warns of the harmful effects of solar radiation.

Indeed, it indicates the following harmful effects:

• A greater likelihood of developing skin cancer
• More or less severe burns
• Premature and accelerated aging: the sun’s rays can promote the formation of free radicals and cause irreversible damage to the molecules and cellular structures of the body
• Eye diseases  of several types, including cataracts

Other potential damage from solar radiation is related to the ineffectiveness of the immune system:

• Altered functions of antigen-presenting cells: this is a collection of cells of the immune system that influence the correct response of this system
• Increased cytosine formation: Cytosines stimulate or decrease the response of the immune system. These are mediators that reduce or multiply the defense effect, depending on the needs of the environment and infections by external agents
• Changes in the phenomenon of lymphocyte recirculation: changes in this process can also affect the immune response. Indeed, they modify the pathways and routes of distribution of white blood cells in the tissues.
• Activation of T lymphocytes: These defense cells protect the body from infections and help fight cancer. If they are activated incorrectly, they cause off-topic reactions that can lead to pathologies

Effects of solar radiation on skin health

One of the most significant health effects of solar radiation is skin cancer. The various skin oncological pathologies have increased over the past 50 years. This seems to be related to the holes in the ozone layer, which has the function of filtering the sun’s rays.

In addition, photoaging (premature aging of the skin) is another damage that the sun, taken in excess, can cause on the dermis. This effect of solar radiation on health manifests itself through skin elastosis on the areas most exposed to the sun  (face, neck, décolleté), in addition to thickening, dryness and deep wrinkles.

A photoaged skin has spots and hyperpigmented areas, because it has undergone an alteration of the melanocytes. It will also exhibit very large pores as well as the appearance of thick, rough skin. This is due to a phenomenon known as hyperkeratinization .

Prevention of the effects of solar radiation on the skin

Not all people run the same risks in the face of the sun. Depending on the type of skin, we may be more or less prone to complications. Therefore, it is important to keep in mind the phototype of each person. Because white skin, for example, is more sensitive to radiation than dark skin.

How can we prevent the effects of the sun’s radiation on health? First of all, it must be taken into account that the harmful effects accumulate. In other words, we have a solar capital from birth that should not be exceeded throughout our life. In the event of exposure to the sun, it is essential to apply protective products adapted to each type of skin.

Finally, children under three should not stay in the sun for too long. The recommended time slots must be respected, as well as the geographical location  and the season of the year. Indeed, the sun’s rays reach the Earth with different intensity, depending on the altitude and the season.