There are many mental illnesses, and I’ll provide you with a comprehensive list:

Neurodevelopmental Disorders

1. Attention Deficit Hyperactivity Disorder (ADHD)

2. Autism Spectrum Disorder (ASD)

3. Intellectual Disability

4. Learning Disabilities (e.g., dyslexia, dyscalculia)

Psychotic Disorders

1. Schizophrenia

2. Schizoaffective Disorder

3. Brief Psychotic Disorder

4. Delusional Disorder

Mood Disorders

1. Major Depressive Disorder (MDD)

2. Bipolar Disorder (I, II, and Cyclothymic Disorder)

3. Persistent Depressive Disorder (Dysthymia)

4. Premenstrual Dysphoric Disorder (PMDD)

Anxiety Disorders

1. Generalized Anxiety Disorder (GAD)

2. Panic Disorder

3. Social Anxiety Disorder

4. Specific Phobias

5. Obsessive-Compulsive Disorder (OCD)

6. Post-Traumatic Stress Disorder (PTSD)

7. Acute Stress Disorder

Personality Disorders

1. Paranoid Personality Disorder

2. Schizoid Personality Disorder

3. Schizotypal Personality Disorder

4. Antisocial Personality Disorder

5. Borderline Personality Disorder

6. Histrionic Personality Disorder

7. Narcissistic Personality Disorder

8. Avoidant Personality Disorder

9. Dependent Personality Disorder

10. Obsessive-Compulsive Personality Disorder

Dissociative Disorders

1. Dissociative Amnesia

2. Dissociative Fugue

3. Depersonalization Disorder

4. Dissociative Identity Disorder (DID)

Eating Disorders

1. Anorexia Nervosa

2. Bulimia Nervosa

3. Binge Eating Disorder

4. Other Specified Feeding or Eating Disorder (OSFED)

Sleep-Wake Disorders

1. Insomnia Disorder

2. Hypersomnolence Disorder

3. Narcolepsy

4. Sleep-Related Eating Disorder

5. Sleepwalking Disorder

Sexual Dysfunctions

1. Erectile Disorder

2. Female Orgasmic Disorder

3. Male Hypoactive Sexual Desire Disorder

4. Female Hypoactive Sexual Desire Disorder

Gender Dysphoria

1. Gender Dysphoria in Children

2. Gender Dysphoria in Adolescents and Adults

Trauma- and Stressor-Related Disorders

1. Post-Traumatic Stress Disorder (PTSD)

2. Acute Stress Disorder

3. Adjustment Disorders

Substance-Related and Addictive Disorders

1. Substance Use Disorders (e.g., alcohol, opioids, cannabis)

2. Gambling Disorder

Neurocognitive Disorders

1. Delirium

2. Mild Neurocognitive Disorder

3. Major Neurocognitive Disorder (e.g., Alzheimer’s disease)

This is not an exhaustive list, and some sources may group or categorize mental illnesses differently.

Keep in mind that mental illnesses are complex and multifaceted, and only a qualified mental health professional can provide an accurate diagnosis and treatment plan.