There are many therapists who specialize in specific conditions. I do not work that way. Instead, I view all symptoms-physical, emotional, or social-as coming out of a relationship process in the family. The goal is to modify that process, which can lead to a reduction in symptoms.
Personally, I am uncomfortable with the current emphasis on diagnosis. Being able to accurately diagnose a medical condition is essential to treatment. The same principle has been applied to mental disorders which has not turned out to be as effective, and can in many situations make things worse. I think it is far more accurate to look at the functioning of a family system as a whole and to view the symptomatic individual(s) within the context of what is happening between people.