The answer is no. Sitting at a modern laptop and viewing the screen for six hours will not cause cancer.
This is an urban myth, dating back to the days when television screens used high-voltage electron guns that theoretically posed some danger. The laptop screen uses a different technology.
Hello, that is very strange, I really do not know why that would happen. I know if I am using my computer too much, my eyes start to get blurry, but, I have not gotten over-heated or anything.
I would recommend you post in the Undiagnosed Symptoms Forum vs the Cancer Forum.
I have read that people have experienced health problems related to prolonged exposure to electromagnetic fields; it is called electromagnetic hypersensitivity (EHS). These claims are controversial though.
Just google the above and see if that gives you some answers.