Is there a single clinical depression cause, you may ask yourself? I doubt it, and so might you.
Biological and environmental factors contribute to the development of depression.
We live in an age of uncontrollability and helplessness.
Depression seems to be the emotion that comes in the wake of helplessness, individual failure, and unrealized attempts to gain power.
Compared to the time when our grandparents were young, depression is ten times higher today, and the rate is still on the rise.
People with depression are much younger, reaching into late childhood and early adolescence.
Clinical depression cause: Medical conditions

• Low thyroid function (up to 60 % of people with low thyroid function have depression)
• Brain injuries and diseases (e.
  g.
  stroke, heart disease, head injury, epilepsy, Parkinson's and Alzheimer's Disease)
• Some forms of cancer
• Hormone imbalance in women and men
• Infectious diseases
• Eating disorders
• Blood vessel disease in the brain due to diabetes and/or hypertension
• Some steroid and hormonal treatments
• Anaemia
• Chronic pain
• Quitting smoking.
  

Clinical depression cause: Personality traits that put you at high risk

• always worrying
• perfectionists
• sensitive to personal criticism
• unassertive
• self-critical and negative
• shy, socially anxious and have low self-esteem

There are many forms of depression.
Clinical depression is often caused by neurotransmitter imbalances in the brain, specially the lack of serotonin.
Like a clover with four leaves, depression symptoms fall into four clusters:

• The way you think is different when you are depressed from the way you think when you are not.
  
• When you are depressed, you feel awful, your mood is affected: you feel discouraged, sad, in a black pit without exit
• You are passive, indecisive, and suicidal, everything is hard for you, every most routine task.
  Your behaviour is affected.
  
• Your body plays up.
  You can neither eat nor sleep, you can't make love.
  

Are you now convinced that there is not only one clinical depression cause alone but many? To be depressed, you needn't to have all symptoms.
However, the more symptoms you have, and the more intense each is, the more sure you can be that you have got depression.
I love things that we can change - mild and moderate depression is one of them.
Do you want let life pass by you? Do you want to miss out on joy and pleasure you get from pursuing things you like doing? Do you want to miss out on being connected with people that you love?