I had one last September and plan to have another one this September. I hadn't had one in over a decade. My BP was a bit high, not high enough for drugs but something to pay attention to and learn I needed to walk more. Since my triglycerides and chloresterol (sp?) numbers were in the normal range I wasn't advised to change my diet.
You're very right! As a volunteer fireman I get free physical every year. Last year a friend of mine found out he had a lung tumor and he had surgery to remove it! He had no symptoms and if it went undiscovered for much longer could have been fatal!