Much of the following facts about mental illness is provided by The NAMI National organization. Spanish and other language translations of this information may also be available from the NAMI National website.

NOTE: The information provided on this page is for informational purposes only. It is not intended to substitute for a medical professional’s opinion, diagnosis, and/or treatment plan.

Learn More About Mental Health Conditions

A mental illness is a condition that affects a person’s thinking, feeling or mood. Such conditions may affect someone’s ability to relate to others and function each day. Each person will have different experiences, even people with the same diagnosis.

Recovery, including meaningful roles in social life, school and work, is possible, especially when you start treatment early and play a strong role in your own recovery process.

A mental health condition isn’t the result of one event. Research suggests multiple, linking causes. Genetics, environment and lifestyle influence whether someone develops a mental health condition. A stressful job or home life makes some people more susceptible, as do traumatic life events like being the victim of a crime. Biochemical processes and circuits and basic brain structure may play a role, too.

One in 5 adults experiences a mental health condition every year. One in 17 lives with a serious mental illness such as schizophrenia or bipolar disorder. In addition to a person’s directly experiencing a mental illness, family, friends and communities are also affected.

Half of mental health conditions begin by age 14, and 75% of mental health conditions develop by age 24. The normal personality and behavior changes of adolescence may mimic or mask symptoms of a mental health condition. Early engagement and support are crucial to improving outcomes and increasing the promise of recovery.

Specific Mental Health Conditions

ADHD (Attention Deficit/Hyperactivity Disorder ADD/ADHD Printable Fact Sheet)

Anxiety DIsorders(Anxiety Disorders Printable Fact Sheet)

Autism Spectrum Disorders

Bipolar Disorder (Bipolar Disorder printable Fact Sheet)

Borderline Personality Disorder (BPD)   (Borderline Personality Disorder printable Fact Sheet)

Depression  (Depression Printable Fact Sheet)

Dissociative Disorder  (Dissociative Disorders printable Fact Sheet)

Dual Diagnosis: Substance Abuse and Mental Illness  (Dual Diagnosis printable Fact Sheet)

Early Psychosis and Psychosis  (Psychosis printable Fact Sheet)

Eating Disorders (Eating Disorders printable Fact Sheet)

Obsessive-Compulsive Disorder (OCD) (Obsessive-Compulsive Disorder printable Fact Sheet)

Post-Traumatic Stress Disorder (PTSD)  (Post-Traumatic Stress Disorder printable Fact Sheet)

Schizoaffective Disorder  (Schizoaffective Disorder printable Fact Sheet)

Schizophrenia  (Schizophrenia printable Fact Sheet)

 Conditions Sometimes Related to Mental Illness

Anosognosia (“Lack of Insight”)  (Anosognosia printable Fact Sheet)

Risk of Suicide (Risk of Suicide printable Fact Sheet)

Self-Harm (Self-harm printable Fact Sheet)

Sleep Disorders (Sleep Disorders printable Fact Sheet)