Mood disorders (depression and bipolar)
Introduction
Mood disorders affect how individuals feel, think, behave, and function in daily life. They are characterized by persistent disturbances in mood that interfere with relationships, work, self-care, and safety. Depression and bipolar disorder exist on a spectrum of mood dysregulation and are among the most frequently tested psychiatric conditions on the NCLEX.
For nurses, the priority is not diagnosis but assessment, safety, therapeutic communication, and medication monitoring. Many NCLEX questions focus on recognizing mood patterns, identifying suicide risk, responding to mania safely, and choosing the most therapeutic nursing action.
Other psychosocial integrity topics - crisis intervention, grief and loss, and cultural or spiritual influences on care - are covered in their own dedicated chapters rather than here.
Learning objectives
By the end of this section, you should be able to:
- Differentiate depressive episodes from manic and hypomanic episodes.
- Identify common assessment findings in mood disorders.
- Recognize suicide risk and implement safety interventions.
- Apply nursing care strategies for both depression and bipolar disorder.
- Anticipate medication-related nursing considerations.
- Answer NCLEX-style questions involving mood instability and safety.
Overview of mood disorders
Mood disorders involve disruptions in emotional regulation that persist beyond normal mood fluctuations.
Core features
- Altered mood (sadness, irritability, euphoria).
- Changes in energy and activity level.
- Impaired concentration and decision-making.
- Sleep and appetite disturbances.
- Impaired functioning.
- Increased suicide risk.
Comparing the three episode types
The load-bearing distinction is duration and severity. Depression and mania are opposite poles of mood; hypomania is a milder, shorter version of mania that never reaches the severity that defines a full manic episode.
The following table compares depressive, manic, and hypomanic episodes by minimum duration and by severity, including whether psychosis or hospitalization can occur.
| Episode | Minimum duration | Severity |
|---|---|---|
| Depressive | At least 2 weeks | Marked impairment; suicide risk |
| Manic | At least 1 week (any duration if hospitalized) | Marked impairment; psychosis and hospitalization possible |
| Hypomanic | At least 4 days | Noticeable change but no severe impairment, no psychosis, no hospitalization |
The key exam discriminator between mania and hypomania: if there is psychosis, marked impairment, or a need for hospitalization, the episode is mania, not hypomania.
Depressive disorders
Depression is more than sadness. It is a pervasive condition that affects emotional, cognitive, physical, and behavioral functioning.
Assessment findings in depression
- Persistent sadness or emptiness.
- Anhedonia (loss of interest or pleasure).
- Fatigue or low energy.
- Sleep disturbances (insomnia or hypersomnia).
- Appetite or weight changes.
- Impaired concentration.
- Feelings of worthlessness or guilt.
- Slowed speech or movement.
- Suicidal ideation or passive death wishes.
Nursing interventions
- Assess suicide risk directly and repeatedly.
- Establish a therapeutic relationship.
- Encourage expression of feelings.
- Promote structure and routine.
- Assist with basic self-care.
- Reinforce medication adherence.
- Coordinate mental health referrals.
Bipolar disorder
Bipolar disorder includes episodes of mania or hypomania, often alternating with periods of depression. Manic episodes are medical emergencies characterized by deteriorating judgment, sleep disturbances, and impaired impulse control.
Assessment findings in mania
- Elevated or irritable mood
- Decreased need for sleep
- Pressured or rapid speech
- Flight of ideas
- Distractibility
- Grandiosity
- Impulsive or risky behaviors
- Poor judgment
- Agitation or aggression
Nursing interventions during mania
- Ensure the safety of client and others.
- Set clear, consistent limits.
- Reduce environmental stimuli.
- Use calm, firm communication.
- Avoid power struggles.
- Provide high-calorie finger foods, since a manic client is too restless and distractible to sit through a meal and is at risk for nutritional and fluid deficits.
- Monitor sleep, hydration, and activity.
- Administer medications as prescribed.
Suicide risk and safety
Suicide risk exists in both depression and bipolar disorder and may increase during energy improvement before mood improves.
High-risk indicators
- Expressed suicidal ideation or plan.
- Prior suicide attempts.
- Sudden calmness after depression.
- Giving away possessions.
- Severe agitation or insomnia.
- Substance use.
- Lack of social support.
Example: Sudden calmness after depression
A client who has been severely depressed for two weeks suddenly seems calm, cheerful, and full of energy. A nurse unfamiliar with mood disorders might chart this as improvement.
- Sudden calmness after a period of depression can mean the client has decided on a suicide plan and now has the energy to act on it, not that the depression has lifted.
- The nurse asks directly: “Are you thinking of harming yourself?”
- The nurse maintains close observation and initiates suicide precautions per facility policy rather than waiting to see if the calm mood continues.
Answer: Treat sudden calmness after depression as a possible suicide risk indicator, not as evidence of improvement, until a direct risk assessment says otherwise.
Nursing interventions
- Ask directly about suicidal thoughts.
- Implement suicide precautions as indicated.
- Maintain close observation.
- Remove harmful objects.
- Involve interdisciplinary mental health teams.
- Document assessments objectively.
Medication considerations
While medication management is provider-directed, nurses play a crucial role in monitoring the effects and safety of medications.
Antidepressants
- May take several weeks for full effect.
- Monitor for increased suicidality early in treatment.
- Educate clients not to stop abruptly.
Mood stabilizers (e.g., lithium)
- Narrow therapeutic range.
- Therapeutic range: 0.6-0.8 mEq/L for maintenance therapy, up to 0.8-1.2 mEq/L during acute mania.
- Monitor serum levels.
- Ensure adequate hydration and sodium intake, because dehydration or a low-sodium diet (from vomiting, diaphoresis, diuretics, or NSAID use) causes the kidneys to reabsorb more lithium along with sodium, raising serum lithium toward toxic levels.
- Report tremors, diarrhea, vomiting, confusion, or ataxia.
Antipsychotics (often used in mixed mania)
- Monitor for extrapyramidal symptoms.
- Assess metabolic side effects.
- Reinforce adherence.
Therapeutic communication strategies
- Use empathy and validation.
- Avoid minimizing feelings.
- Maintain calm, structured interactions.
- Set limits respectfully.
- Redirect impulsive behaviors.
- Reinforce reality gently when appropriate.