There is mounting evidence that radiation exposure increases an individual's cancer risk. This is especially true with certain CT scans or multiple CT scans. Follow this link to calculate your risk.
If you need assistance, ask your primary care physician (PCP) to give you the number and type of studies you have had. You can enter the information using this free website. As you have more studies you can see if your risk is increasing. This is something you will want to discuss with your own PCP, especially before any new studies are done.