What is the official definition of mood disorders?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Mood disorders are mental health conditions that primarily affect a person's emotional state, causing persistent extreme feelings such as sadness, hopelessness, or elevated euphoria. Common types include major depressive disorder, bipolar disorder, and persistent depressive disorder (dysthymia). These conditions can disrupt sleep, energy, focus, and daily functioning, but they are treatable with therapy, medication, and lifestyle support.

If you've been experiencing mood changes that interfere with your life, understanding what's happening is the critical first step toward feeling better. Rather than guessing or waiting weeks for an appointment, take a free, instant, online symptom check to get personalized insights based on your specific symptoms. It takes just a few minutes, is backed by medical experts, and can help you clarify next steps—whether that's seeing a professional, exploring self-care strategies, or simply gaining peace of mind.

Reviewed for medical accuracy: 07/20/2026

Important Next Steps

Learn if mood changes need care today Discover likely causes of mood disorder symptoms Find out if it could be depression See OTC options for mood-related symptoms Find a doctor for mood disorders Understand home remedies for mood swings Check if mood disorder symptoms need care

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Explanation

Mood disorders are a group of mental health conditions that primarily affect a person's emotional state. People with mood disorders might experience prolonged periods of extreme sadness, known as depression, or excessive euphoria or irritability known as mania. These conditions can significantly impact daily life, making it hard to function normally.

Types of Mood Disorders

Depressive Disorders: These include major depressive disorder, where individuals feel very sad or lose interest in activities they once enjoyed.
Bipolar Disorders: This involves mood swings that range from high (mania) to low (depression).
Other Mood Disorders: These include disorders like cyclothymic disorder, which involves less severe mood swings.

Impact on Life

Mood disorders can affect relationships, work, and overall quality of life. It's important for individuals experiencing symptoms to seek help. If you're noticing changes in your mood or emotional patterns, consider taking a free AI symptom checker to better understand what you might be experiencing and when to seek professional care.

(References)

Angst J, Ajdacic-Gross V, & Rössler W. (2015). Classification of mood disorders. Psychiatria polska, 26488343.
Rakofsky J, & Rapaport M. (2018). Mood Disorders. Continuum (Minneapolis, Minn.), 29851879.
Datta S, Suryadevara U, & Cheong J. (2021). Mood Disorders. Continuum (Minneapolis, Minn.), 34881733.

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