In psychotherapy we investigate how disease affects individuals' psychological well-being, and how psychological issues can contribute to the development of physical illness.

An individual who becomes seriously ill or injured faces many different practical stressors. The stressors include problems meeting medical and other bills; problems obtaining proper care when home from the hospital; obstacles to caring for dependents; having one's sense of self-reliance compromised; gaining a new, unwanted identity as a sick person; and so on. These stressors can lead to depression, reduced self-esteem, etc

Psychologist can provide techniques and other assistance that promote healing.

Therapy also concerns itself with bettering the lives of individuals with terminal illness. When there is little hope of recovery, health psychologist therapists can improve the quality of life of the patient by helping the patient recover at least some of his or her psychological well-being.

Source: http://www.wikipedia.com