Depression affects millions of people each year with varying degrees of severity. Some people may experience it for a period of a few weeks, whilst for others, it may be a lifelong disorder that resurfaces seemingly without warning. No two people are ever the same, and so the causes of depression do tend to vary.
Sources of depression
There can be an element of genetic inheritance, with some studies suggesting that people who have family members with a history of depression will be more likely to suffer with it themselves. Depression has also been linked with long term alcohol and drug use, bad dietary habits, stress and illness.