"Annual checkups and tests such as colonoscopies and PSA assays are important, but it's not a good idea to rely on tests alone to protect you from cancer. It's just as important to listen to your body and notice anything that's different, odd, or unexplainable. (You should also listen to those close to you, such as a wife or partner, because others sometimes notice things we're unaware of—or don't want to admit.) You don't want to join the ranks of cancer patients who realize too late that symptoms they'd noticed for a long time could have sounded the alarm earlier, when cancer was easier to cure."
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