Depression: Biological Depression

This type of depression is possibly the most doubtful one. Perhaps environmental depression is the one that seems more reliable to us. Biological depression is often querried wether scientists are correct or not in their explanations. However, there is a case that merely clears this doubts; twins. Twins carry the exact same genes, and if one is depressed, the other one is prone to be depressed as well.

It is possible that our depression comes from mom and dad. In this case, you are more likely to become depressive even with minimal unfortunate events. Of course other factors influence depression, but being biologically depressive makes you naturally vulnerable towards depression in any situation.