Even if you are a non-smoker that doesn’t make you immune from oral cancer. According to the doctors, one in five can have this cancer which is not related to tobacco use. You may be suffering from human papillomavirus (HPV), the same infection that causes cervical cancer in women. Because the lesions are very small in size and are hidden behind your throat, it becomes very difficult for the doctors to diagnose it. If you feel that you have a sore throat for a long period, change in your speech, or problem in swallowing then you should not wait for any further and get it checked asap.