"Viewed through the prism of neurotherapy, human beings do not suffer an epidemic of depression, chronic pain, immune system dysfunction, addictions, anxiety, or any one of a laundry list of other affections. Instead, the epidemic is in hyperactive or worn-out nervous systems - buffeted by birth perhaps, infancy and childhood certainly, by a culture that encourages overwork and has created some of the most stressful places on earth: modern cities"

"A Symphony in the Brain" by Jim Robbins

Therapeutic applications

Neurofeedback has been effectively used with following problems:

ADHD (Attention Deficit Hyperactivity Disorder)
Learning disabilities (including dyslexia)
Anxiety
Problems with memory
Sleep disorder
Bed wetting
Depression
Chronic pain
Migranes and other headaches
Pre-Menstrual Syndrome
Seizure disorder
Post-Traumatic Stress Disorder
Stroke
Addictions
Autism
Eating disorder (anorexia, bulimia)
Autoimmune disfunction
Obsessive-Compulsive Disorder

If you want more specific data according to each of these problems please see this page at EEG Spectrum