Why is it always raining endlessly in spring, which makes people sad?

Because our country belongs to subtropical monsoon climate, this is the reason.

As for the rain, it makes people sad.

There is an old saying: "Dizzy, frustrating." It means that in the rainy season, people are lazy and unhappy. Through in-depth research, Chinese medical meteorologists found that rainy weather affects people's mental health mainly because the light in rainy weather is weak and the human body secretes more pineal hormones, so the secretion concentration of thyroxine and adrenaline is relatively reduced, and people's nerve cells are therefore "lazy" and become less "active", and people will become listless.