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Sunbeds, tanning and UV exposure
The desire to acquire a tan for fashion or cosmetic purposes has led to a large increase in the use of artificial tanning sunbeds in, mostly, developed countries. Use of sunbeds for tanning continues to increase in popularity, especially among young women.
Sunbeds used in solariums, and sun tanning lamps, are artificial tanning devices that claim to offer an effective, quick and harmless alternative to natural sunlight. However, there is growing evidence that the ultraviolet (UV) radiation emitted by the lamps used in solariums may damage the skin and increase the risk of developing skin cancer.
Some 132 000 cases of malignant melanoma (the most fatal kind of skin cancer) and over two million cases of other skin cancers occur worldwide each year. One in every three cancers diagnosed worldwide is a skin cancer. Most skin cancers are attributable to over-exposure to natural UV radiation. A fact sheet indicating the adverse health consequences from natural (i.e., sun) UV exposure issued by the World Health Organization (WHO) can be found at the link to the right.
This fact sheet is the complement of the above, providing information on artificial sources of UV. Primary among these artificial sources is sunbeds, and this fact sheet looks at the health consequences of sunbed usage and how they can be managed. Information for this fact sheet comes from WHO sponsored meetings and workshops, recent scientific literature, reviews by WHO Member States and the recommendations of international NGOs.
Exposure to UV, either naturally from the sun or from artificial sources such as sunlamps, is a known risk factor for skin cancer. Short-wavelength UVB (280-315 nm) has been recognized for some time as carcinogenic in experimental animals, and there is increasing evidence that longer-wavelength UVA (315-400 nm) used in sunbeds, which penetrates more deeply into the skin, also contributes to the induction of cancer. A study conducted in Norway and Sweden showed a significant increase in the risk of malignant melanoma among women who had regularly used sunbeds.
Additional exposure to UV from sunbeds is likely to enhance the well-known detrimental consequences of excessive solar UV exposure. There is no evidence to suggest that UV exposure from any type of sunbed is less harmful than UV exposure from the sun. Pre-cancerous actinic keratoses and Bowen’s disease have also been found in sunlight-protected but sunbed exposed skin in fair-skinned users after just two to three years of regular sunbed use.
Skin ageing, eye damage and other adverse health effects
Any excessive exposure to UV, not just from sunbeds, can result in structural damage to human skin. In the short term this damage can be due to burning, fragility and scarring and in the longer-term as photoageing. Photoageing, caused by the breakdown of collagen in the skin by UV, manifests itself as wrinkling and loss of elasticity.
The effects of UV on the eye include cataracts, pterygium (a white coloured growth over the cornea) and inflammation of the eye such as photokeratitis and photoconjunctivitis. Furthermore, excessive UV exposure can suppress the immune system, possibly leading to a greater risk of infectious diseases.
Some skin types are unsuitable for tanning
Based on their susceptibility to sunburn, skin types are classified into six different classes (I – VI). People with skin type I have the lightest skin and may not have even a light tan after repeated exposure to a sunbed. Instead, their skin generally suffers sunburn reactions. People with skin type I are more likely to use sunbeds than people with darker skin.
The ability of the consumer to recognize their skin type as not suitable for sunbed use is based on either self-diagnosis, or worst, a bad experience of sunburn. For this reason sunbed operator training is needed to ensure correct skin type diagnosis. While skin type II and higher can tan, skin damage can still occur following excessive exposure to UV.
Dangers associated with childhood UV exposure
Childhood exposure to UV and the number of times a child is burnt by UV, either from the sun or from sunbeds, are known to increase the risk of developing melanoma later in life. For this reason, particular attention is required to ensure children and adolescents do not use sunbeds. The United States Department of Health and Human Services has classified exposure to sunlamps or sunbeds as "known to be carcinogenic to humans" and states that the longer the exposure, the greater the risk, especially to people exposed before the age of 30 years.
Sunbeds emit predominantly UVA and some UVB, both of which can damage the DNA in cells of the skin. However, in recent years, lamps of sunbeds have been manufactured that produce higher levels of UVB to mimic the solar spectrum and speed the tanning process. While UVB has well known carcinogenic properties and whose excessive exposure is known to lead to the development of skin cancers, recent scientific studies suggest that high exposures to the longer wavelength UVA could also have an impact on skin cancer occurrence.
As with sun exposure, recent studies indicate a relationship between the use of sunbeds and malignant melanoma as well as non-melanoma skin cancers such as squamous and basal cell carcinomas. Thus, the consequences of regular sunbed use may include disfigurement from removal of skin cancers, early death if the cancer is a malignant melanoma, as well as substantial costs to national health systems for screening, treating and monitoring skin cancer patients.
Aside from tanning, many people claim that use of sunbeds helps them to be more relaxed and have a feeling of wellbeing. It is difficult to quantify such claims.
While sunbed use may increase vitamin D synthesis, predominantly from the UVB component, for the majority of the population, incidental exposure to the sun, combined with normal dietary intake of vitamin D, provides adequate vitamin D for a healthy body throughout the year. If people require more vitamin D than the sun can provide (for example, because of living in polar regions) this should be supplemented through diet rather than sunbed use.
Only in very rare and specific cases should the medically-supervised use of sunbeds be considered. Medical UV devices successfully treat certain skin conditions such as dermatitis and psoriasis. These treatments should only be conducted under qualified medical supervision in an approved medical clinic and not unsupervised either in commercial tanning premises or at home using a domestic sunbed.
There is a widespread false belief that a tan acquired using a sunbed will offer good skin protection against sunburn for a holiday in a sunny location. In reality, a tan acquired using a sunbed offers only limited protection against sunburn from solar UV. It has been estimated that a sunbed tan offers the same protective effect as using a sunscreen with a sun protection factor (SPF) of only 2-3.
Strong case for effective regulations governing sunbed use
As long as sunbeds are available to the public, there is a need for guidelines or legislation to reduce the risks associated with their use. WHO encourages governments to formulate and enforce effective laws governing the use of sunbeds. In countries where voluntary industry codes of practice exist, the sunbed owners have generally not shown significant capacity to self regulate effectively.
Of highest regulatory priority should be the restriction of use by persons under 18 years as well as banning unsupervised trained personel. WHO recommendations are consistent with those of the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and the European Society for Skin Cancer Prevention (EUROSKIN).
The key reasons why regulations are necessary
In its 2003 publication ICNIRP recommends against the use of UV-emitting appliances for tanning or other non-medical purposes. ICNIRP states that the following groups are at particularly high risk of incurring adverse health effects from UV, and therefore should be particularly counseled against the use of tanning appliances:
Action of the World Health Organization
INTERSUN, the Global UV project, is a collaborative project between WHO, the United Nations Environment Programme, the World Meteorological Organization, the International Agency on Cancer Research and ICNIRP that aims to reduce the burden of disease resulting from exposure to UV radiation. The project assesses and quantifies health risks, and develops an appropriate response through guidelines, recommendations and information dissemination. Beyond its scientific objectives, INTERSUN provides guidance to national authorities and other agencies about effective sun awareness programmes. These address different audiences such as occupationally exposed people, tourists, school children and the general public.
In 2003 WHO published a brochure entitled "Artificial tanning beds: risks and guidance" providing advice to the public, operators of sunbed facilities and member states on how sunbeds could be managed to protect public health.
Agar NS, Halliday GM, Barnetson RS, et al. (2004) The basal layer in human squamous tumors harbors more UVA than UVB fingerprint mutations: a role for UVA in human skin carcinogenesis, Proc Natl Acad Sci 101(14):4954-9.
AGNIR (2002) Advisory Group on Non-ionising Radiation Health. Effects from Ultraviolet Radiation. Documents of the NRPB 13 (1).
ICNIRP (2003) International Commission on Non-Ionizing Radiation Protection. Health Issues of Ultraviolet Tanning Appliances Used for Cosmetic Purposes. Health Physics 84: 119-127.
IEC (1995) International Electrotechnical Commission. Safety of household and similar electrical appliances. Part 2: Particular requirements for appliances for skin exposure to ultraviolet and infrared radiation. Geneva:IEC 335-2-27.
McKinlay A and Repacholi MH (2000) Ultraviolet Radiation Exposure, Measurement and Protection. Radiation Protection Dosimetry 91( vols 1-3).
United States Department of Health and Human Services (2004) 11th Report of Carcinogens. National Institute of Environmental Health Sciences, Research Triangle Park, NC. p III-266-267.
Veierød MB, Weiderpass E, Thörn M, et al. (2003) A prospective study of pigmentation, sun exposure, and risk of cutaneous malignant Melanoma in women. J Nat Cancer Inst 95:1530–1538.
WHO (1994) World Health Organization. Environmental Health Criteria 160. Ultraviolet Radiation Geneva.
WHO (2003) World Health Organization. Artificial tanning sunbeds - risks and guidance. Geneva
Young et al. (2003) UV-induced pigmentation in human skin. In: P.U. Giacomoni, ed. Sun Protection in Man. Amsterdam: Elsevier; pp. 357-375
Young A (2004) Tanning devices - Fast track to skin cancer?, Pigment Cell Res, 17: 2-9.
Sources: US Department of Health; The World Health Organization