Can xrays and blood tests show or detect cancer? Can xrays and blood tests show cancer? What are the best ways to detect cancer?

It . It depends what kind of cancer. There are some types of cancer that can be detected by special blood tests, although many of these tests can be abnormal in other conditions too and they are mostly used to check up on people who already are diagnosed cancer in whom the doctor knows that the blood test is abnormal because of the cancer. Mammography is now the only proven x-ray study for screening people without cancer in order to find a new cancer (breast) early. However, there are studies being done to see if ct scans can help diagnose more early lung cancers in people at high-risk like heavy smokers. Other than mammography, most imaging studies are used only when someone has some sort of suspicious symptom or other finding in order to determine if a tumor is the cause of the problem. They are also used for "staging" after a cancer has been diagnosed which means to look to see where the cancer might have spread. Finally, imaging tests might be used to follow how well a treatment is working or to look for a recurrence after treatment has stopped. The problem with imaging studies is that most of them can only find a tumor that is a few millimeters in size. This is already hundreds of millions of cancer cells. You need to talk to your doctor about cancer screening. She or he can discuss the appropriate screening tests for you which depend on your age, gender, environmental exposures, and family history. These may include things like a psa test and rectal exam for prostate cancer, mammography or other images for breast cancer, a blood test and pelvic exam for uterine cancer, a pap smear for cervical cancer, a stool test and/or colonoscopy for colon cancer, or others.
Agree with Dr. S. You can reduce your risk of cancer by having a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week . Do not use tobacco, alcohol, weed or street drugs. Get HPV vaccine.