Mood Swings

What is it?

Mood swings are rapid or exaggerated shifts in emotional state that can disrupt daily function and relationships. They exist on a spectrum from normal emotional reactivity to clinically significant instability seen in bipolar disorder, borderline personality disorder, and hormonal conditions. Premenstrual dysphoric disorder (PMDD) causes severe mood shifts tied to the menstrual cycle. Perimenopause is a major driver in midlife women. In adolescents, some emotional variability is normal but warrants attention if severe. Medical causes — thyroid dysfunction, blood sugar instability, sleep deprivation — should always be excluded.

Common causes

When to see a doctor

• 1Mood shifts are severe, rapid, or causing harm to relationships or work
• 2Episodes of extremely elevated mood with decreased need for sleep and impulsive behavior (mania)
• 3Mood instability with self-harm urges, suicidal thoughts, or intense fear of abandonment
• 4Mood swings with significant changes in energy, sleep, or appetite
• 5Mood changes tied to the menstrual cycle that are severely disabling (PMDD)
• 6New mood instability after a head injury or neurological event

What you can do

• ✓Track moods daily in an app or journal — patterns help identify triggers and guide treatment
• ✓Prioritize consistent sleep — even one night of poor sleep dramatically destabilizes mood
• ✓Regular aerobic exercise is one of the most powerful mood stabilizers available
• ✓Minimize alcohol — a potent mood disruptor, especially for people with mood disorders
• ✓Blood sugar stability matters — eat regular meals to prevent hypoglycemia-driven irritability
• ✓Mindfulness-based therapies and dialectical behavior therapy (DBT) have strong evidence for mood regulation

Conditions that cause this symptom

Medications that may help

Treatment depends on the underlying cause. Always consult your provider before starting any medication.

Frequently asked questions