Blood tests can detect a lot of cancers. I've been working in Japan for many years now. It is normal for people to get blood work done every year here. After

Blood tests can detect a lot of cancers. I've been working in Japan for many years now. It is normal for people to get blood work done every year here. After age 40 they also do a barium test for stomach cancer. I think every year for that is a bit much, so I skipped it this year... They also usually do a chest X-ray every year which can catch tuberculosis as well as lung cancer. And for women obviously yearly pap smears and mamograms. Over 35 for men, I think you are supposed to get yearly prostate exams. I have not done this and I am planning to get an exam as soon as I can manage it. Don't wait for symptoms. It's sounds like a lot, but doing the above is really fairly straight forward and not expensive.