The potential benefits and potential risks of undergoing a CT exam are different for each person. For most people, the potential risks of a CT exam are very low, especially if the doctor determines that the exam will yield important medical information. However, if a person undergoes multiple CT exams, or is exposed to high doses of radiation, the potential risks may increase.
Doctors try to use the lowest dose of radiation possible during a CT exam to minimize potential risks. In addition, doctors will consider more carefully children, pregnant women, and specific groups of people concerned about radiation exposure.
So if you need a CT exam, you can ask your doctor about the specific risks of radiation exposure and understand the trade-offs between potential benefits and risks.