If your wisdom teeth fit well in your mouth, are easy to clean, and contribute to good function, then you really do not have a problem.  However, if these conditions do not exist you may develop associated problems.
Fully or partially impacted wisdom teeth could result in:
The development of dental cysts affecting health of the surrounding bone, teeth and soft tissue such as your dental nerves.
Dental caries on the partially erupted wisdom tooth leading to the development of caries on the adjacent tooth, or a dental abscess on the impacted tooth itself.
Is affecting the periodontal (gum) health of adjacent teeth.
Repeated soft tissue infections of the tissue around the erupting tooth (called Pericoronitis).