It has been asserted that the DNA in each cell of human body is exposed to oxidative damage every day. The balance between the damage and repair on DNA breaks down during the disease conditions. Significantly for the treatment modalities it is important to know how oxidative stress affects the human organism during the chronic diseases. Also the rehabilitation of patient and improvement of the life quality of patient who has a chronic disease are considered to be important. In this context, recognition of the risks of chronic diseases (oxidative stress) is inadequate, and improving and supporting the treatments of these individuals who are under risks are necessary.