Warts are common skin infections caused by human papillomavirus (HPV) and affect most people sometime in their life. A number of epidemiological studies on the prevalence of warts have been completed in schools, various occupational groups, general practices and hospitals. All studies have relied on a subjective measure for the diagnosis of warts. Cross-sectional studies completed in schools have shown the prevalence in children to vary from 2 to 20%. Occupational handlers of meat, poultry and fish have a higher prevalence than other workers. Children and young adults are the groups most affected. Future studies are needed to investigate the true frequency of warts in the community and the likelihood of an individual developing these lesions during his/her lifetime.