Yours is a delicate question. There could be many reasons that a psychologist would be involved. It is important that a patient is in good mental health before undergoing a surgery. Some patients feel pressured by family members or loved ones, while other patients feel unsupported by family members and loved ones. Either situation can produce conflict that a psychologist can help with. In addition, it is important that each patient have a realistic expectation of what the result will look like, and how it will change one's life. Think of Meryl Streep: she does not have a classically "perfect" nose but has been able to achieve great success in her acting career. If a patient thinks that a "bad nose" is the only obstacle to success in life, a psychologist can help frame this notion more realistically. These are only some of the reasons, but I hope they help you.