Major Psychological Disorders to Know for AP Psychology
1. What You Need to Know
Psychological disorders on AP Psych are tested as clusters of symptoms + typical patterns (thoughts, feelings, behaviors) that cause distress and/or impairment. You’re expected to recognize disorders from short scenarios, distinguish similar ones, and use the DSM framework (not to “diagnose,” but to classify).
Core ideas AP Psych expects
- DSM-5(-TR): the main classification system (lists criteria for disorders). AP questions often mirror DSM-style symptom lists.
- Four D’s (quick abnormality screen): Deviance, Distress, Dysfunction, Danger (not an official DSM rule, but a common AP tool).
- Biopsychosocial approach: disorders usually involve biological (genes, brain, neurotransmitters), psychological (cognition, learning, emotion), and social (stress, culture) factors.
- Diathesis–stress model: a vulnerability (diathesis) + stress can trigger a disorder.
- Comorbidity: disorders often co-occur (e.g., depression + anxiety).
Reminder for FRQs/ethics: You describe patterns and criteria; you don’t claim you can clinically diagnose a real person from one behavior.
2. Step-by-Step Breakdown
AP questions are usually “identify the disorder” or “which feature best supports diagnosis?” Use this fast decision process.
A. Step-by-step: Identify a disorder from a vignette
- Name the symptom type first
- Anxiety/fear? Mood change? Psychosis? Personality pattern? Eating/weight? Trauma? Neurodevelopment?
- Check duration + triggers (AP loves this)
- Panic attacks: minutes; panic disorder needs ongoing worry/behavior change.
- MDD: at least 2 weeks.
- Mania: about 1 week (or hospitalization).
- PTSD: more than 1 month; acute stress disorder: 3 days–1 month.
- Look for the “signature” symptom
- OCD: intrusive obsessions + repetitive compulsions.
- Schizophrenia: delusions/hallucinations + disorganization/negative symptoms.
- Bipolar I: manic episode.
- Anorexia: restriction + significantly low weight + fear of gaining.
- Rule out common confusions
- DID vs schizophrenia (identity states vs hallucinations/delusions).
- OCD vs OCPD (anxiety-driven rituals vs perfectionistic personality style).
- GAD vs panic disorder (chronic worry vs unexpected attacks).
- Bipolar vs “moodiness” (mania/hypomania are distinct syndromes).
- Choose the best match and justify with 2–3 concrete details
- On MCQ/FRQ, your points come from specific symptoms (“recurrent unexpected panic attacks,” “compulsions consume hours,” “grandiosity + decreased need for sleep”).
B. Micro-example of the method
- Vignette: “For 8 months, Sam worries daily about school, family health, and money; feels restless, irritable, and has trouble sleeping.”
- Symptom type: anxiety/worry; Duration: 8 months; Signature: excessive worry across domains.
- Answer: Generalized Anxiety Disorder (GAD).
3. Key Formulas, Rules & Facts
(No math here—just high-yield rules.)
A. Big diagnostic “buckets” (what AP focuses on)
| Category | Key idea | High-yield disorders to know | Quick ID clues |
|---|---|---|---|
| Anxiety Disorders | Fear/anxiety out of proportion | GAD, Panic Disorder, Phobias, Social Anxiety, Agoraphobia | Avoidance, physical arousal, persistent worry |
| OCD & Related | Obsessions/compulsions or related repetitive behaviors | OCD, Hoarding, Body Dysmorphic, Trichotillomania | Time-consuming rituals or fixation on perceived flaws |
| Trauma/Stressor-Related | Symptoms after trauma/stressor | PTSD, Acute Stress Disorder | Intrusions/flashbacks + avoidance + hyperarousal |
| Depressive Disorders | Low mood/anhedonia | Major Depressive Disorder | 2+ weeks, vegetative symptoms, impaired functioning |
| Bipolar Disorders | Mania/hypomania + mood shifts | Bipolar I, Bipolar II | Manic energy, decreased sleep, risky behavior |
| Schizophrenia Spectrum | Psychosis + impairment | Schizophrenia (also brief psychotic, schizophreniform) | Delusions/hallucinations + disorganization + negative symptoms |
| Dissociative Disorders | Disruption of identity/memory | Dissociative Identity Disorder, Dissociative Amnesia | Identity states, memory gaps, depersonalization |
| Somatic Symptom & Related | Distressing bodily symptoms + excessive focus | Somatic Symptom Disorder, Illness Anxiety, Conversion Disorder | Medical explanation absent/insufficient; high health anxiety |
| Personality Disorders | Inflexible, enduring maladaptive traits | Antisocial, Borderline, Narcissistic (plus clusters) | Long-term pattern across contexts |
| Eating Disorders | Disturbed eating/weight control | Anorexia, Bulimia, Binge-Eating Disorder | Restriction vs binge/purge vs binge-only |
| Neurodevelopmental | Early-onset developmental patterns | ADHD, Autism Spectrum Disorder | Childhood onset; school/social functioning |
| Neurocognitive | Decline from prior functioning | Major neurocognitive disorder (e.g., Alzheimer’s) | Progressive memory/cognitive decline |
| Substance-Related | Problematic use + impairment | Substance Use Disorder | Tolerance/withdrawal + life disruption |
B. Anxiety disorders (recognition facts)
| Disorder | Defining features | What to listen for in vignettes |
|---|---|---|
| GAD | Excessive worry most days about many things; hard to control; physical tension | “Worries about everything,” restless, muscle tension, sleep issues |
| Panic Disorder | Recurrent unexpected panic attacks + ongoing concern/avoidance | “Out of nowhere,” sudden terror + heart racing + fear of dying/losing control |
| Specific Phobia | Intense fear of a specific object/situation; avoidance | Heights, spiders, needles; immediate fear response |
| Social Anxiety Disorder | Fear of negative evaluation/social scrutiny | Avoids presentations, parties; fear of embarrassment |
| Agoraphobia | Fear/avoidance of places where escape is hard | Avoids crowds, buses, malls; may stay home |
C. OCD and related
| Disorder | Core concept | Typical trap |
|---|---|---|
| OCD | Obsessions (intrusive thoughts) + compulsions (rituals) to reduce anxiety | It’s not “liking neatness”; it’s distressing + time-consuming |
| Hoarding Disorder | Persistent difficulty discarding items | Not just clutter—impairs living spaces |
| Body Dysmorphic Disorder | Preoccupation with perceived appearance flaw | Can resemble eating disorders but focus is “defect” |
D. Trauma/stressor-related
| Disorder | Key timing | Key symptom clusters |
|---|---|---|
| Acute Stress Disorder | 3 days–1 month after trauma | Intrusion, negative mood, dissociation, avoidance, arousal |
| PTSD | More than 1 month | Intrusions/flashbacks, avoidance, negative mood/cognitions, hyperarousal |
E. Mood disorders (depression + bipolar)
| Disorder | Signature | High-yield notes |
|---|---|---|
| Major Depressive Disorder (MDD) | At least 2 weeks of depressed mood and/or anhedonia + other symptoms | Symptoms can include sleep/appetite change, fatigue, worthlessness, concentration issues, suicidal ideation |
| Bipolar I | Manic episode (may also have depression) | Mania can include grandiosity, decreased need for sleep, pressured speech, risky behavior |
| Bipolar II | Hypomanic episode + major depressive episode (no full mania) | Hypomania is less severe than mania, but still a noticeable change |
F. Schizophrenia spectrum (AP’s key features)
| Concept | What it means | Examples |
|---|---|---|
| Positive symptoms | “Added” experiences | Delusions, hallucinations, disorganized speech/behavior |
| Negative symptoms | “Subtracted” functioning | Flat affect, reduced speech (alogia), avolition, social withdrawal |
| Delusion vs hallucination | False belief vs false perception | “CIA is tracking me” vs hearing voices |
Quick timeline distinctions (often tested):
- Brief psychotic disorder: psychosis lasting less than 1 month.
- Schizophreniform: 1–6 months.
- Schizophrenia: signs of disturbance for 6+ months (with major impairment).
G. Dissociative vs somatic symptom disorders
| Disorder | Core feature | Vignette clue |
|---|---|---|
| Dissociative Identity Disorder (DID) | 2+ identity states + memory gaps | “Different selves,” amnesia for actions, trauma history possible |
| Dissociative Amnesia | Inability to recall important autobiographical info | “Can’t remember” key events; may involve fugue |
| Depersonalization/Derealization | Feeling detached from self/world | “I feel unreal,” “like I’m watching myself” |
| Somatic Symptom Disorder | Distressing somatic symptoms + excessive thoughts/behaviors | Repeated doctor visits; high distress |
| Illness Anxiety Disorder | Preoccupation with having illness with minimal symptoms | “Convinced I have cancer” despite reassurance |
| Conversion Disorder (Functional Neurological) | Neurological symptoms incompatible with medical findings | Paralysis, blindness, seizures without neurological basis |
H. Personality disorders (AP emphasis)
Personality disorders are enduring, inflexible, and show up across situations.
| Cluster | Theme | Examples |
|---|---|---|
| A (odd/eccentric) | suspicious/withdrawn | Paranoid, Schizoid, Schizotypal |
| B (dramatic/erratic) | impulsive/emotional | Antisocial, Borderline, Histrionic, Narcissistic |
| C (anxious/fearful) | anxious/avoidant | Avoidant, Dependent, OCPD |
High-yield individual ones:
- Antisocial PD: disregard for others’ rights, deceit, impulsivity, lack of remorse (pattern; often history of conduct problems).
- Borderline PD: instability in relationships/self-image/emotions + impulsivity; fear of abandonment; self-harm may appear.
- Narcissistic PD: grandiosity, need admiration, lack of empathy.
I. Eating disorders (don’t mix them up)
| Disorder | Defining pattern | Key distinction |
|---|---|---|
| Anorexia Nervosa | Restriction leading to significantly low weight + intense fear of gaining | Low weight is central; may overexercise |
| Bulimia Nervosa | Binge eating + compensatory behaviors (vomiting, laxatives, excessive exercise) | Weight may be normal range |
| Binge-Eating Disorder | Binges without compensatory behaviors | Distress about binges; often weight gain |
J. Neurodevelopmental + neurocognitive + substance
| Disorder | Core idea | Vignette clue |
|---|---|---|
| ADHD | Inattention and/or hyperactivity-impulsivity across settings, childhood onset | School trouble, distractibility, fidgeting, blurting |
| Autism Spectrum Disorder (ASD) | Social communication deficits + restricted/repetitive behaviors | Limited reciprocity, fixated interests, sensory sensitivities |
| Major Neurocognitive Disorder (e.g., Alzheimer’s) | Significant cognitive decline | Progressive memory loss + impaired daily functioning |
| Substance Use Disorder | Problematic use causing impairment/distress | Failed attempts to cut down, tolerance/withdrawal, neglect roles |
4. Examples & Applications
Example 1: Panic disorder vs GAD
- Vignette: “Jordan has sudden episodes of terror with chest tightness and dizziness; now avoids the gym because he fears it will happen again.”
- Key insight: Unexpected panic attacks + avoidance/worry afterward → Panic Disorder (not just general worry).
Example 2: PTSD vs Acute Stress Disorder
- Vignette: “Two weeks after a car crash, Mei has nightmares, feels numb, avoids driving, and startles easily.”
- Key insight: Trauma symptoms within 3 days–1 month → Acute Stress Disorder (PTSD requires more than 1 month).
Example 3: Schizophrenia vs DID
- Vignette A: “Luis believes neighbors planted cameras in his walls and hears voices commenting on him.” → Schizophrenia spectrum (delusions + hallucinations).
- Vignette B: “Ava finds clothes she doesn’t remember buying and is told she acted like a different person.” → DID (identity states + amnesia), not schizophrenia.
Example 4: Anorexia vs Bulimia
- Vignette: “Priya restricts food intensely, is significantly underweight, and still fears ‘getting fat.’” → Anorexia Nervosa.
- Vignette: “Chris binges secretly then vomits and feels ashamed; weight is near average.” → Bulimia Nervosa.
5. Common Mistakes & Traps
Mixing up delusions and hallucinations
- Wrong: calling a false belief a hallucination.
- Fix: Delusion = belief; hallucination = perception (hearing/seeing/feeling things).
Assuming OCD is just being neat/organized
- Wrong: equating OCD with perfectionism.
- Fix: OCD involves intrusive distressing thoughts + compulsions to reduce anxiety; it’s time-consuming/impairing.
Confusing schizophrenia with DID
- Wrong: “multiple personalities” = schizophrenia.
- Fix: schizophrenia = psychosis (delusions/hallucinations); DID = identity disruption + amnesia.
Calling any anxiety a panic disorder
- Wrong: labeling chronic worry as panic.
- Fix: panic disorder requires recurrent unexpected panic attacks plus persistent concern/behavior change.
Overcalling bipolar disorder
- Wrong: “mood swings” = bipolar.
- Fix: bipolar requires mania/hypomania syndrome (decreased need for sleep, grandiosity, pressured speech, risky behavior). Irritability alone isn’t enough.
Forgetting PTSD timing
- Wrong: diagnosing PTSD at 2 weeks post-trauma.
- Fix: Acute stress is 3 days–1 month; PTSD is more than 1 month.
Mixing up anorexia and bulimia
- Wrong: thinking bulimia always means underweight.
- Fix: Anorexia = significantly low weight from restriction; bulimia = binge + compensatory behaviors (often normal-range weight).
Treating personality disorders like short episodes
- Wrong: describing a brief phase as borderline/antisocial.
- Fix: personality disorders are enduring patterns across time and contexts.
6. Memory Aids & Quick Tricks
| Trick / Mnemonic | Helps you remember | When to use it |
|---|---|---|
| Four D’s: Deviance, Distress, Dysfunction, Danger | Quick abnormality screen | When asked what makes behavior “disordered” |
| D = Delusion (belief) / H = Hallucination (hearing/seeing) | Psychosis vocabulary | Schizophrenia-spectrum questions |
| PTSD = Post = “Past 1 month” | PTSD timing threshold | PTSD vs acute stress |
| BiPolar I = “I = Intense” (full mania) | Bipolar I has mania | Bipolar I vs II |
| Bipolar II = “Two parts”: hypomania + depression | Bipolar II structure | Bipolar classification |
| Anorexia = “A” for Absent weight | Low weight is central | Eating disorder ID |
| Bulimia = “Binge + Bathroom” | Binge then purge/compensate | Bulimia vs binge-eating |
| Cluster B = “Bad Boundaries/Behavior” | Dramatic/erratic PDs | Personality disorder clusters |
7. Quick Review Checklist
- You can quickly sort a vignette into: anxiety, mood, psychosis, trauma, personality, eating, dissociative/somatic, neurodevelopmental, substance, neurocognitive.
- You know the signature pairs:
- OCD = obsessions + compulsions
- Panic disorder = unexpected attacks + persistent worry/avoidance
- MDD = 2+ weeks depressed mood/anhedonia
- Bipolar I = mania; Bipolar II = hypomania + depression
- PTSD = trauma symptoms lasting more than 1 month
- Schizophrenia = psychosis + impairment (positive/negative symptoms)
- You won’t mix up:
- Delusions vs hallucinations
- Schizophrenia vs DID
- Anorexia vs bulimia vs binge-eating
- You can name at least one key symptom and one distinguishing clue for each major disorder above.
You’ve got this—if you anchor on the “signature symptom + timing,” most AP disorder questions collapse into an easy match.