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The short answer: Depression rarely has a single cause. It's almost always a combination of biological, psychological, and social factors. Some people are more vulnerable due to genetics or early experiences, and a trigger (like loss or stress) can cause the depression to develop.
The 3 Main Categories
Scientists use the biopsychosocial model to understand depression. This means three types of factors work together:
🧬 Biological
- Genetic predisposition (heredity)
- Brain chemistry (neurotransmitters)
- Hormonal changes
- Chronic illnesses
- Certain medications
🧠 Psychological
- Negative thinking patterns
- Low self-esteem
- Perfectionism
- Trauma or abuse
- Unprocessed grief
Biological Causes
🧬 Genetics & Heredity
If depression runs in your family, you have 2-3x greater chance of developing depression yourself. But note: heredity is not destiny. It means you're more vulnerable, not that depression is inevitable.
Twin studies show genetics explains about 40% of the risk. The remaining 60% comes from environment and lifestyle.
⚗️ Brain Chemistry
In depression, there is often an imbalance in neurotransmitters:
- Serotonin: Affects mood, sleep, and appetite
- Dopamine: Regulates motivation and pleasure
- Noradrenaline: Energy and alertness
Antidepressants often work by restoring this balance.
🏥 Physical Factors
- Chronic illnesses: Diabetes, heart disease, cancer
- Hormonal changes: Pregnancy, menopause, thyroid
- Medications: Some medications have depression as a side effect
- Vitamin deficiencies: Especially vitamin D and B12
Psychological Causes
💭 Negative Thinking Patterns
People with depression often have a negative view of themselves, the world, and the future. This is called the "cognitive triad."
- "I'm no good at anything" (self)
- "The world is unfair" (world)
- "It will never get better" (future)
Cognitive behavioral therapy (CBT) helps break these patterns.
😔 Trauma & Early Experiences
Traumatic childhood experiences increase the risk of depression later:
- Neglect or abuse
- Loss of a parent
- Bullying
- Insecure attachment
Social Causes
🏠 Life Circumstances
- Loneliness: Lack of social support is a strong risk factor
- Relationship problems: Conflicts, divorce, loss of partner
- Work: Stress, bullying, job loss, burnout
- Financial: Debt, poverty, uncertainty
- Living conditions: Unsafe environment, poor housing
⚡ Triggers & Life Events
Often there is a specific trigger that causes the depression to develop:
- Death of a loved one
- End of a relationship
- Job loss
- Illness (your own or a loved one's)
- Major change (moving, retirement)
- Chronic stress that lasts too long
Important: Not everyone who experiences these factors gets depression. It's the combination of vulnerability + trigger that determines whether someone becomes depressed.
Risk Factors
⚠️ Increased Risk With
Family history of depression
Being female (2x more common)
Previous depressive episode
Childhood trauma
Chronic illness
Substance use
Little social support
Chronic stress
Protective Factors
✅ What Protects Against Depression
- Strong social network - friends, family, community
- Regular exercise - proven as effective as medication for mild depression
- Good sleep hygiene - consistent sleep schedule
- Healthy nutrition - Mediterranean diet is linked to less depression
- Purpose - work, hobbies, spirituality
- Early help - don't wait until it gets worse
What can you do? You can't change biological factors, but you DO have influence on psychological and social factors. Coaching or therapy can help with thinking patterns, and you can actively work on social contacts and lifestyle.
Do You Recognize Risk Factors?
Don't wait until it becomes a problem. With MentraNova, you can work preventively on your mental health. No waiting times, start immediately.
Frequently Asked Questions
There is no single "main" cause. Depression arises from a combination of genetic predisposition, brain chemistry, psychological factors (like thinking patterns) and social factors (like stress or loneliness).
Partially. If depression runs in your family, you have 2-3x greater chance. But heredity explains only 40% - your lifestyle and environment determine the rest.
Prolonged stress can trigger depression, especially in people with predisposition. Chronic stress changes brain chemistry and depletes your reserves.
Women are diagnosed with depression 2x as often. This is possibly due to hormonal factors, social pressure, and the fact that women seek help sooner (men are under-reported).