The difference between grief and major depressive disorder

Major Depressive Disorder (MDD) is a serious but treatable condition. Learn about its causes, key depression symptoms, and the most effective treatment options available.

8 March, 2026

Feeling persistently sad or have you lost interest in things you once enjoyed? Don't ignore these feelings. Understanding Major Depressive Disorder is the first step toward getting help and reclaiming your life.

What are the main causes of Major Depressive Disorder?

  • Imbalances in neurotransmitters, the brain's chemical messengers that regulate mood, are thought to be a primary cause of depression.
  • Having a close family member with clinical depression increases your risk, suggesting a genetic predisposition can make some people more vulnerable.
  • Traumatic or stressful events, such as the loss of a loved one or financial problems, can trigger the onset of MDD.
A chart explaining depression symptoms

Key symptoms of Major Depressive Disorder to watch for

  • A core MDD symptom is a depressed mood for most of the day, nearly every day, a key part of the DSM-5 criteria.
  • Markedly diminished interest or pleasure in all, or almost all, activities (anhedonia) is another significant sign of clinical depression.
  • Experiencing changes in sleep, like insomnia or oversleeping, and persistent fatigue or loss of energy are also common depression symptoms.

How can you prevent Major Depressive Disorder effectively?

  • A primary treatment is psychotherapy ("talk therapy"), which helps individuals develop coping strategies and address underlying issues with a professional.
  • Doctors often prescribe antidepressants, like SSRIs, to help correct chemical imbalances in the brain associated with the symptoms of depression.
  • Regular exercise, a balanced diet, consistent sleep, and strong social support play a crucial role in managing MDD symptoms and improving well-being.

>>> Read to understand more: Frontotemporal dementia - When personality and behavior change

The top Major Depressive Disorder images everyone is searching for

A therapist providing major depressive disorder treatment
The difference between sadness and clinical depression
A list of common MDD symptoms
An animation of how antidepressants work in the brain
A person experiencing symptoms of clinical depression
Different types of major depressive disorder treatment
What is Major Depressive Disorder? An infographic

>>> See more photos: Chiari malformation - When brain tissue extends into the spinal canal

Major Depressive Disorder is a treatable condition. If you recognize these symptoms, please reach out to a healthcare or mental health professional for a proper diagnosis and support.

>>> Update more information: Syringomyelia - Understanding cysts within the spinal cord