: This paper analyzes Jack’s behavior after being diagnosed with a chronic disease, identifies his potential causes of disturbance of self-concept, and offers recommendations for Jack to follow in order to accept his new lifestyle, and stop being in denial, plus analyzing how the behavior of self-disclosure and time can help in accepting his new lifestyle. Major Case Issues: The case explains a 36-year-old Jack who is a professional leader in a hospital, he is supportive to his team and focuses on eating healthy, exercising regularly and playing on his church’s basketball team. However, his focus on healthy living declined due to focus on professional responsibilities for over a year, on his regular medical check-ups, he was diagnosed with a chronic disease, however, his reaction has been a denial of the diagnosis and a self-prescription of continued healthy living although he is aware of his family health history. (Self-concept case, 2010). Why Jack’s self-esteem may be negat