Wouldn't it be great if we could receive full-body scans every year to check for early signs of cancer and other disease? Even if possible and affordable -- right now, scans cost about $900 -- it still wouldn't be such a great idea.

Full-body scans often result in false alarms. People with harmless abnormalities may end up facing more tests, more risks, and more worry in order to rule out illness. The scan itself can present health hazards too. It exposes patients to more radiation than a chest X-ray and could slightly increase the risk of cancer, especially for those scanned every year.

How do we know, then, if something has gone awry in our bodies? Well, we can do our self-exams -- breast exams, testicular exams, skin exams -- and we can report for annual check-ups. We can respond to symptoms we experience -- if headaches are bothersome and persistent, your doctor may prescribe a head scan -- and we can pursue tests and screening that we really need for cancer prevention and early detection. Here are just a few:

Did you know that at least 200,000 people die every year from cancers related to where they work? The main reasons are from inhaling asbestos fibers and second hand smoke. This was reported today by the World Health Organization (WHO).

About 125 million people are exposed to asbestos at work, leading to at least 90,000 deaths per year. Benzene, an organic compound used in rubbers, dyes and pesticides, causes thousands to die of leukemia each year. Those subjected to second hand smoke have twice the risk of developing lung cancer than those that work in a smoke free environment.

This means that we could be preventing so many cancer deaths if the industries would tighten safety standards for their employees.