Depression is influenced by the conditions and situations of life, by the family, the people around, but also by the personality. Since the personality is related to the horoscope sign, then the latter affects depression.
Giorno dopo Giorno has made a classification of the signs most likely to experience depression, but of course there are exceptions.
The crab
Hypersensitivity and empathy make a highly predisposed sign more likely to experience depression. Cancer, you often take the blame of others and suffer from the suffering of others.
Scorpio
Scorpio is another sign prone to depression because of the mystery it contains.
Gemini
The variability of character makes them often experience fluctuations in emotions and feelings. They express things as they feel.
Pisces
Those born under the sky of Pisces are also prone to depression as it is an extremely sensitive sign. As a defense mechanism to react to adversity, Pisces always implements some kind of defense strategy which turns out to be harmful.