Cognitive Behavioral Therapy
Cognitive behavioral therapy (CBT) focuses on exploring relationships among a person's thoughts, feelings and behaviors. During CBT a therapist will actively work with a person to uncover unhealthy patterns of thought and how they may be causing self-destructive behaviors and beliefs.
By addressing these patterns, the person and therapist can work together to develop constructive ways of thinking that will produce healthier behaviors and beliefs. For instance, CBT can help someone replace thoughts that lead to low self-esteem ("I can't do anything right") with positive expectations ("I can do this most of the time, based on my prior experiences").
Studies of CBT have shown it to be an effective treatment for a wide variety of mental illnesses, including depression, anxiety disorders, bipolar disorder, eating disorders and schizophrenia. Individuals who undergo CBT show changes in brain activity, suggesting that this therapy actually improves your brain functioning as well.
The above information was borrowed from National Alliance on Mental Illness.