Mood Disorders Overview

Understanding Mood Disorders

What Are Mood Disorders?

Definition: Mood disorders are a category of mental health disorders characterized by significant disturbances in emotional state, mood regulation, and affect that cause substantial impairment in functioning and quality of life.

Mood vs. Emotion:

• Emotion: Brief, specific response to particular stimulus (joy at good news, anger at insult)
• Mood: More sustained emotional state lasting hours, days, weeks, or longer; colors entire experience

Normal Mood Variations vs. Mood Disorder:

Normal Mood Variations:

• Everyone experiences ups and downs
• Sadness after loss or disappointment is normal
• Happiness and excitement after positive events is normal
• Mood changes are proportionate to life events
• Temporary and resolve with time or changed circumstances
• Don’t significantly impair functioning

Mood Disorder:

• Extreme, persistent mood disturbances
• Out of proportion to circumstances (or no clear cause)
• Chronic and enduring without treatment
• Cause significant distress and functional impairment
• Affect multiple life areas (work, relationships, self-care)
• May require professional treatment

Two Major Categories of Mood Disorders

1. Depressive Disorders

Characterized by: Persistent sad, empty, or irritable mood; loss of interest/pleasure; accompanied by cognitive and physical symptoms

Major Types:

• Major Depressive Disorder (MDD): One or more major depressive episodes
• Persistent Depressive Disorder (Dysthymia): Chronic, long-term depression (at least 2 years)
• Premenstrual Dysphoric Disorder: Mood symptoms related to menstrual cycle
• Disruptive Mood Dysregulation Disorder: Chronic irritability in children
• Depressive Disorder Due to Medical Condition: Depression caused by medical illness
• Substance/Medication-Induced Depressive Disorder: Depression caused by substances

Focus of This Course: Major Depressive Disorder

2. Bipolar and Related Disorders

Characterized by: Periods of depression alternating with periods of mania (elevated, expansive, or irritable mood) or hypomania (less severe mania)

Major Types:

• Bipolar I Disorder: At least one manic episode (may or may not have depressive episodes)
• Bipolar II Disorder: At least one hypomanic episode and at least one major depressive episode (no full manic episodes)
• Cyclothymic Disorder: Chronic fluctuation between hypomanic and depressive symptoms (not meeting full criteria)
• Bipolar Disorder Due to Medical Condition: Mood swings caused by medical illness
• Substance/Medication-Induced Bipolar Disorder: Mood swings caused by substances

Focus of This Course: Bipolar I and II Disorders

Prevalence of Mood Disorders

Depressive Disorders:

• Major Depressive Disorder:
  • Lifetime prevalence: 15-20% (1 in 5-6 people)
  • 12-month prevalence: 6-7%
  • One of the most common mental health disorders
  • Gender: Females affected 2x more than males
  • Age: Can occur at any age; peak onset late teens to mid-20s

Bipolar Disorders:

• Bipolar I Disorder:
  • Lifetime prevalence: ~1%
  • Equal rates in males and females
  • Age of onset: Usually late teens to early 20s
• Bipolar II Disorder:
  • Lifetime prevalence: ~0.5-1%
  • More common in females
  • Age of onset: Mid-20s

Comparative Prevalence:

• Depression much more common than bipolar disorder
• Mood disorders collectively affect ~20% of population in lifetime
• Second most common category of mental disorders (after anxiety disorders)

Impact and Burden

Major Depressive Disorder:

• Leading cause of disability worldwide (WHO data)
• Major contributor to suicide deaths
• Enormous economic burden (healthcare costs, lost productivity)
• Severe impact on quality of life

Bipolar Disorder:

• Among most disabling mental illnesses
• High suicide risk (15-20% of those with bipolar disorder die by suicide)
• Significant functional impairment during episodes
• Difficulty maintaining employment, relationships

Global Burden:

• Depression: #1 cause of years lived with disability (YLDs)
• Combined with anxiety, mood disorders represent massive public health challenge

Core Symptoms of Depression

Emotional Symptoms:

• Depressed mood: Feeling sad, empty, hopeless, tearful most of the day, nearly every day
• Anhedonia: Loss of interest or pleasure in activities once enjoyed (hobbies, sex, socializing)
• Irritability: Especially common in children, adolescents, some adults
• Feelings of worthlessness or excessive guilt: Often unrealistic or exaggerated
• Emptiness: Feeling hollow, numb, disconnected

Cognitive Symptoms:

• Difficulty concentrating: Trouble focusing, making decisions
• Memory problems: Forgetfulness, especially for recent events
• Negative thinking: Pessimistic thoughts about self, world, future (“cognitive triad”)
• Rumination: Repetitively thinking about problems and negative experiences
• Slowed thinking: Thoughts seem to move slowly
• Recurrent thoughts of death or suicide: Suicidal ideation, plans, or attempts

Physical/Somatic Symptoms:

• Sleep disturbances:
  • Insomnia (difficulty falling asleep, staying asleep, early morning awakening)
  • Hypersomnia (sleeping excessively)
• Appetite/weight changes:
  • Decreased appetite and weight loss
  • Increased appetite and weight gain
• Psychomotor changes:
  • Retardation: Slowed movements, speech, reactions
  • Agitation: Restlessness, pacing, hand-wringing
• Fatigue and loss of energy: Exhaustion even after rest
• Physical aches and pains: Headaches, body aches, stomach problems

Behavioral Symptoms:

• Social withdrawal and isolation
• Reduced activity level
• Neglect of responsibilities
• Poor self-care and hygiene
• Substance use (self-medication)
• Self-harm behaviors
• Suicidal behaviors

Severity Range:

• Mild: Few symptoms beyond minimum required; minor functional impairment
• Moderate: Symptoms and functional impairment between mild and severe
• Severe: Many symptoms beyond minimum; marked interference with functioning
• With psychotic features: Presence of delusions or hallucinations (severe cases)

Core Symptoms of Mania

Elevated/Expansive Mood:

• Euphoria: Extremely happy, “on top of the world”
• Inflated self-esteem or grandiosity: Unrealistic beliefs about one’s abilities, importance, or identity
• Excessive optimism: Everything seems possible and wonderful
• Expansive: Outgoing, talkative, expressing emotions freely

Irritable Mood:

• Easily annoyed or angered
• Hostile reactions to perceived slights
• Impatience with others
• Can alternate with euphoria

Increased Activity and Energy:

• Goal-directed activity: Taking on multiple projects simultaneously
• Increased productivity (at least initially): Working on many things
• Restlessness: Unable to sit still
• Psychomotor agitation: Excessive, purposeless movement

Cognitive/Thought Changes:

• Racing thoughts: Thoughts move extremely rapidly
• Flight of ideas: Rapid shift from one topic to another with tenuous connections
• Distractibility: Attention easily drawn to irrelevant stimuli
• Increased talkativeness: Pressure of speech (rapid, loud, difficult to interrupt)
• Poor judgment: Failing to recognize risks or consequences

Behavioral Symptoms:

• Decreased need for sleep: Feeling rested after only 2-3 hours of sleep
• Increased goal-directed activity: Starting many projects
• Excessive involvement in pleasurable activities with high potential for painful consequences:
  • Spending sprees: Buying things impulsively, spending beyond means
  • Sexual indiscretions: Uncharacteristic sexual behavior, multiple partners
  • Reckless behavior: Reckless driving, dangerous activities
  • Foolish business investments: Unrealistic business ventures
• Increased sociability: Seeking out others, overly friendly with strangers

Functional Impairment:

• Marked impairment in social or occupational functioning
• May require hospitalization to prevent harm to self or others
• Psychotic features may be present (delusions, hallucinations)

Hypomania vs. Mania

Similarities:

• Same types of symptoms (elevated mood, increased activity, decreased sleep, etc.)
• Both represent departure from normal functioning

Key Differences:

Hypomania:

• Noticeable change from usual functioning
• More energy, less sleep, more talkative, more productive
• Observable by others
• But not severe enough to cause marked impairment
• Person may feel great, be more productive
• Often goes unrecognized as problem (especially by person experiencing it)

Mania:

• Severe and unmistakable
• Clearly impairs functioning
• Person cannot maintain work, relationships, responsibilities
• Often requires hospitalization
• High risk behaviors
• May include psychosis (in severe cases)
• Person’s judgment significantly impaired

Mood Episodes

Major Depressive Episode:

• At least 5 symptoms (including depressed mood or anhedonia)
• Present most of the day, nearly every day
• For at least 2 weeks
• Cause significant distress or impairment
• Not due to substance or medical condition

Manic Episode:

• Elevated, expansive, or irritable mood
• Increased activity or energy
• At least 3 additional symptoms (4 if mood only irritable)
• Present most of the day, nearly every day
• For at least 7 days (or hospitalization required)
• Marked impairment or psychotic features
• Not due to substance or medical condition

Hypomanic Episode:

• Same symptom types as manic episode
• At least 4 days duration
• Observable change in functioning
• Not severe enough to cause marked impairment
• No psychotic features
• Not due to substance or medical condition

Patterns and Course

Major Depressive Disorder:

• Single episode: One major depressive episode in lifetime (minority of cases)
• Recurrent: Two or more major depressive episodes (majority of cases; ~80% have recurrence)
• Chronic: Episode lasting 2+ years
• Episodic with interepisode recovery: Episodes separated by periods of normal functioning
• Episodic with residual symptoms: Episodes separated by periods with some symptoms

Episode Duration Without Treatment:

• Typically 6-9 months if untreated
• Some resolve in weeks; others persist years
• Earlier treatment leads to faster recovery

Recurrence:

• After one episode: 50% chance of another
• After two episodes: 70% chance of another
• After three episodes: 90% chance of another
• Risk factors for recurrence: Early age of onset, severe episodes, residual symptoms

Bipolar I Disorder:

• Typically involves multiple episodes across lifetime
• Pattern: Manic episode(s) often alternating with depressive episodes
• Some have only manic episodes (rare)
• Most have depressive episodes (actually spend more time depressed than manic)
• Cycle frequency varies (rapid cycling = 4+ episodes per year)

Bipolar II Disorder:

• Pattern: Hypomanic episode(s) alternating with depressive episodes
• Spend much more time depressed than hypomanic
• Hypomanic episodes shorter and less frequent
• Depressive episodes tend to be severe and prolonged

Course Across Lifespan:

• Both can begin any age but typically late teens to 20s
• Chronic and recurrent conditions
• Between episodes, functioning may return to normal (especially with treatment)
• Risk of recurrence remains throughout life
• Treatment can significantly reduce recurrence rates

Suicide Risk

Major Depressive Disorder:

• 15% of those with severe depression die by suicide
• 60% of all suicides occur in context of mood disorders
• Risk factors: Severity, hopelessness, prior attempts, substance use, lack of support

Bipolar Disorder:

• Even higher risk: 15-20% die by suicide
• Highest risk during depressive episodes and mixed episodes
• Impulsivity during manic episodes also increases risk
• One of highest suicide rates of any mental disorder

Suicide Prevention:

• Early detection and treatment crucial
• Monitoring during high-risk periods
• Safety planning
• Restricting access to means
• Social support
• Immediate intervention for suicidal ideation

Comorbidity

Depression Commonly Co-occurs With:

• Anxiety disorders (50-60%): Most common comorbidity
• Substance use disorders (20-30%): Often self-medication
• Eating disorders (especially bulimia, binge eating)
• Personality disorders (especially borderline)
• Medical conditions: Chronic pain, heart disease, diabetes, cancer

Bipolar Disorder Commonly Co-occurs With:

• Anxiety disorders (50-60%)
• Substance use disorders (40-60%): Very high comorbidity
• ADHD (10-20%): Especially in childhood onset
• Eating disorders
• Medical conditions

Impact of Comorbidity:

• More severe symptoms
• Worse prognosis
• More difficult to treat
• Greater functional impairment
• Higher suicide risk

Gender Differences

Depression:

• 2:1 female to male ratio (most consistent finding)
• Begins in adolescence (equal rates before puberty)
• Possible reasons:
  • Hormonal factors (reproductive hormones)
  • Higher rates of trauma/abuse in women
  • Socialization differences (women more likely to express sadness)
  • Stress from multiple roles
  • Diagnostic bias (men may express differently)

Bipolar Disorder:

• Equal rates in males and females for Bipolar I
• Slightly higher in females for Bipolar II
• Women: More depressive episodes, rapid cycling
• Men: More manic episodes, substance use comorbidity

Age Considerations

Children and Adolescents:

• Depression often presents as irritability rather than sadness
• Somatic complaints common (stomachaches, headaches)
• School problems, social withdrawal
• Increased risk in adolescence (especially girls)
• Bipolar disorder in children controversial; some have severe mood dysregulation

Older Adults:

• Depression often underdiagnosed (symptoms attributed to aging or medical conditions)
• More somatic complaints, less likely to report mood symptoms
• Higher suicide risk (especially elderly white males)
• May present as pseudo-dementia (cognitive symptoms mimicking dementia)
• Medical comorbidity complicates diagnosis and treatment

Cultural Considerations

Cultural Variations in Expression:

• Western cultures: Emphasis on psychological symptoms (sadness, guilt)
• Non-Western cultures: Emphasis on somatic symptoms (pain, fatigue, dizziness)
• Some Asian cultures: Less likely to express emotional distress directly
• Latino cultures: “Nervios” (nerves) - describes combination of anxiety and depressive symptoms

Cultural Factors Affecting:

• Symptom expression
• Willingness to seek treatment
• Stigma associated with mental illness
• Acceptable treatments
• Family involvement in treatment

Importance of Cultural Competence:

• Understanding cultural context of symptoms
• Avoiding misdiagnosis
• Culturally appropriate assessment and treatment
• Including family when culturally appropriate

Key Points for Exams

1. Mood disorders involve significant disturbances in emotional state causing impairment
2. Two major categories: Depressive disorders and Bipolar/Related disorders
3. Major Depressive Disorder:
   • Most common mood disorder (15-20% lifetime prevalence)
   • 2:1 female to male ratio
   • Core features: Depressed mood, anhedonia, cognitive/physical symptoms
   • Typically recurrent; high recurrence after multiple episodes
4. Bipolar I Disorder:
   • At least one manic episode (may have depressive episodes)
   • Equal in males and females
   • ~1% prevalence
   • Manic episode: At least 7 days, marked impairment
5. Bipolar II Disorder:
   • Hypomanic episode(s) + major depressive episode(s)
   • No full manic episodes
   • Hypomania: At least 4 days, less severe than mania
6. Mania vs. Hypomania: Duration (7 vs. 4 days), severity, impairment, psychotic features
7. High suicide risk: Especially in severe depression and bipolar disorder (15-20%)
8. High comorbidity: Especially with anxiety and substance use disorders
9. Depression leading cause of disability worldwide
10. Chronic and recurrent but highly treatable
11. Age of onset: Typically late teens to mid-20s
12. Cultural variations in symptom expression (psychological vs. somatic)