RESUMO
To assess knowledge about seven warning signs of cancer and protective measures of cancer among people in Tehran, Iran. This was a descriptive study. 2500 individuals living in Tehran were took part in the study. Data were collected using a questionnaire that contained three parts: demographic section, questions related to seven warning signs of cancer and protective measures. The results showed that the information on 7 warning signs of cancer was low among the majority [66.6%]. In relation to protective measures also the knowledge was low among the majority [78.7%]. There was a positive relationship between knowledge about seven warning signs of cancer and protective measures of cancer. The knowledge of people about cancer and its prevention measures in Tehran was low. The need for health education campaigns seems necessary