What is the best treatment for health anxiety?

Talk therapy & meds. Like any anxiety disorder, health anxiety or hypochondriasis should be followed by one's primary care doctor and perhaps a psychiatrist or psychologist. Regular physician visits, group therapy for support, and cognitive psychotherapy focusing on realistic beliefs about disease are all part of treatment. Associated mood disorders are best treated with antidepressant medications like ssri's.
Therapy and meds. The best treatments for low-grade generalised anxiety disorder is cognitive behavioral therapy or a serotonergic antidepressant. First-line medications for gad are selective-serotonin reuptake inhibitors (ssris) and serotonin-norepinephrine reuptake inhibitors (snris). Second-line medications include tricyclic antidepressants, benzodiazepines, and certain anti-convulsants.
ERP - A form of CBT. Excessive anxiety related to physical symptoms or a medical condition, sometimes referred to as "health anxiety" or "hypochondriasis" is typically thought of as a type of obsessive compulsive disorder: People are tormented by repeated, unwanted thoughts of their health fear: http://psychcentral.com/lib/ocd-and-health-anxiety/ It responds to Exposure and Response Prevention treatment -a form of CBT.