Notes on Mood Disorders and Their Characteristics

Conceptualizing Mood Disorders

Definitions and Distinctions

• Mood vs. Emotion

  • Mood: A sustained emotional state that generally lasts longer and can influence one's perception of events. Example: Long-term feelings of being down and irritable due to stress at work or school.

  • Emotion: A more transient state that arises in response to specific stimuli. Example: Feeling a strong burst of anger when cut off in traffic.

Characteristics of Mood Disorders

• Severe deviations in mood that significantly impact functioning.

• Depressive and elevated mood states exist on a spectrum:

  • Baseline Mood (Dysthymia): Neutral state where one doesn't feel unusually happy or sad.

  • Normal Emotions: Common fluctuations in mood due to life events, stressors, grief, etc., which are transient and non-pathological.

Range of Mood States

• Left Side (Lower Mood States):

  • Dysthymia: Chronic mild depression persisting for at least two weeks.

• Right Side (Elevated Mood States):

  • Hypomania: Elevated mood with increased energy, talkativeness, and decreased need for sleep without significant life disruption.

  • Mania: Extreme elevation in mood often accompanied by impaired judgment, risky behaviors, and possible psychosis.

Unipolar vs. Bipolar Mood Disorders

• Unipolar Mood Disorders:

  • Long-term depression without experiencing manic episodes.

  • More common than unipolar mania, which is rare.

• Bipolar Mood Disorders:

  • Individuals fluctuate between depressive and elevated moods.

  • Distinction made based on whether the person experiences one mood state or alternates between two.

Diagnosing Major Depressive Episode

• Criteria for a diagnosis of Major Depressive Episode:

  • Presence of at least one of the following for two weeks:

  • Depressed Mood: Sadness, emptiness, hopelessness.

  • Loss of Interest/Pleasure: Lack of enjoyment in activities previously found rewarding.

  • Additional symptoms may include:

  • Changes in weight or appetite (increase/decrease)

  • Changes in sleep patterns (insomnia/hypersomnia)

  • Fatigue or loss of energy

  • Psychomotor agitation or retardation

  • Feelings of worthlessness or excessive guilt

  • Difficulty concentrating or indecisiveness

  • Recurrent thoughts of death or suicidality.

  • Must occur nearly every day and cause significant impairment in functioning.

Major Depressive Disorder vs. Major Depressive Episode

• Major Depressive Disorder:

  • Diagnosis includes experiencing at least one major depressive episode.

  • Must differentiate between depression stemming from significant loss versus clinical depression.

  • Typically recurrent episodes with gaps of at least two months between episodes.

• Implications of diagnosis:

  • Recurrent nature suggests that once diagnosed, it is common for individuals to experience multiple episodes.

Prevalence and Gender Distribution

• Higher prevalence in women, approximately 2:1.

• 20% of the population may experience depression, though the 12-month prevalence rate is lower, indicating recovery.

• Notable increases in depressive symptoms linked to societal factors (e.g., COVID-19 pandemic).

Persistent Depressive Disorder (Dysthymia)

• Milder but chronic form of depression.

• Lasts for at least two years without the individual experiencing non-depressive moods.

• Can coexist with major depressive episodes, where the person may alternate between dysthymia and periods of major depressive episodes.