Answer: No. Depression is a very broad concept. It can have medical reasons, such as the lack of chemical elements in the body. It can be anything.
In principle, depression occurs because a person is a great egoist. He is not satisfied with what he has. It is just that his egoism is not filled.
However, this is a common depression. If we are talking about depression from medical reasons, then everything happens at different levels. Nevertheless, the basis for all diseases at any level is the same: our egoistic desire does not receive a correct fulfillment. It is just like cancer.
In cancer, a cell, instead of being in correct connection with other cells, suddenly begins to devour them and eventually dies itself. That is, any disease is a special egoistic state of our cells.
From the Kabbalah Lesson in Russian 6/11/17