What are the typical symptoms of mood disorders?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Mood disorders are mental health conditions that affect how you feel emotionally. Common symptoms include:

Persistent sadness or unusually elevated mood
Loss of interest in activities you once enjoyed
Changes in sleep patterns (too much or too little)
Shifts in energy levels or fatigue
Difficulty concentrating
Changes in appetite or weight

These symptoms can vary in intensity and may point to conditions like depression, bipolar disorder, or seasonal affective disorder. Because mood symptoms overlap across many conditions, self-diagnosis can be difficult. Taking a free, instant, online symptom check can help you better understand what you may be experiencing and guide your next steps toward appropriate care.

Reviewed for medical accuracy: 07/20/2026

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Explanation

Mood disorders can cause people to feel very sad or very happy. This can affect how they think and act. Some common symptoms include feeling down or sad most of the time, losing interest in things they used to enjoy, and having trouble sleeping or sleeping too much. People might also feel very tired or have a lot of energy, and their appetite might change.

Common Symptoms:

Sadness or Happiness: Feeling very sad or excessively happy for long periods.
Loss of Interest: Not enjoying activities they used to like.
Sleep Changes: Trouble sleeping or sleeping too much.
Energy Levels: Feeling very tired or having too much energy.
Appetite Changes: Eating too much or not enough.

It's important to recognize these symptoms because they can affect daily life. If you're experiencing any of these symptoms and want to better understand what might be causing them, try this free symptom checker to get personalized insights. If you or someone you know is struggling with these feelings, reaching out for help can make a big difference. For support, you can visit 988lifeline.org.

(References)

Angst J, Ajdacic-Gross V, & Rössler W. (2015). Classification of mood disorders. Psychiatria polska, 26488343.
Fava GA. (1999). Subclinical symptoms in mood disorders. Psychological medicine, 10077293.
Minden SL. (2000). Mood disorders in multiple sclerosis: diagnosis and treatment. Journal of neurovirology, 10871806.

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