Oral cancer is one of the most occurring cancers from 1908.Its prevalence is rapidly increasing day by day and the most commonly occurring type is squamous cell carcinoma from which more than 50,000 patients affected per year around the world. In this study we are going to describe the main consequences of oral cancer along with its prevalence & consequences responsible for oral cancer.This study deals with the some of the main consequences of oral cancer with their percentage of causing oral cancer including tobacco intake,alcohol consumption,smoking, genetically inherited factor,effect of sunlight and use of red chili in higher amount.For the purpose of searching its main consequences the efforts were made which are based on the survey of different hospitals and reading out the case history and profile of more than 100 patients.This survey was conducted in different hospitals, diagnostic and treatment centers of Karachi and as a result of this survey the collective efforts that achieved, revealed that those patients who were habitual of taking tobacco are at higher risk (of about 50%) of developing oral cancer.Then the 2 nd most common factor involved in oral cancer is alcohol consumption of about 30%. Along with these two, several factors are also involved including genetic factor, smoking, sunlight and many more.On the basis of this survey it is concluded that the above mentioned consequences are greatly responsible for oral cancer & its prevalence can be prevented by get rid of the main consequences of oral cancer mentioned in this study.