Hypochondriasis is defined as an excessive preoccupation or worry about having an illness. Hypochondriacs obsess over whether they have a disease and what disease it is. They try to avoid anything that could make them sick and stay indoors. Hypochondriacs are always worried and stressed, especially when they find a new "symptom." They are prone to visiting doctors frequently and taking many medications in an attempt to avoid illness and boost their immune system. Hypochondriasis can negatively impact one's social, educational, and work life by constantly worrying about potential diseases.