Understanding DSM-IV Axis I & II: Mental Disorder Classifications

DSM-IV used two diagnostic axes:

• Axis I: Major mental disorders (schizophrenia, bipolar, major depression)—typically severe, impairing daily function.
• Axis II: Personality disorders and intellectual disability—enduring traits causing relational/work problems; intellectual disability involves significant cognitive/adaptive deficits.

Axis I disorders are generally more acutely impairing; Axis II are more chronic but can also seriously impact life. Both warrant professional help if suspected.