Depression can happen to many different people and for many different reasons.
Depression is categorised in different ways by different health organisations around the world, and there is often considerable overlap between some of the categories. This means that if you are trying to identify the type of depression you, or somebody you know, may be suffering from then it may not be quite as straightforward as just identifying one type of depression from the list on this page.
Although depression can strike in different ways and for different reasons, the resulting experiences may be similar and there may be more than one cause in the same person.
This article attempts to categorise depression first according to its severity and then according to some particular reasons for it.
Depression categorised by severity
Major, severe or clinical depression
Everybody has bad days: days when they feel low, in a bad mood and reluctant