With the advent of newer technology, there is a greater tendency amongst patients and doctors to demand that there should be complete diagnosis and evaluation for even the most trivial of complaints. This results in a plethora of investigations. Just like everything else in life, everything comes at a price. The indiscriminate use of CT scans (especially CT head for minor trauma) has greatly increased the risk of developing cancer subsequently. [1]
I think one needs to be sensible and discuss with your doctor, whether a particular investigation is really required, what are the benefits and what are the risks of the procedure.
1. CT Scans May Increase Cancer Risk in Children, Adolescents