Read section 4 "Information and Supports for Individuals and Families,"  Then, please review the section on 'Warning Signs for Onset or Relapse`(section 2.34-2.35). This will give you a good indication of what to look for in terms of when to assess mental health or substance use disorder in patients presenting for other reasons, as well as when to assess for relapses in patients with a known mental health issue or substance use disorder.