Why is it easy to be in a bad mood on rainy days?

This is because of the existence of depression in rainy days.

In the continuous rainy weather, it is difficult for people to have a good mood and it is easy to get depression. Their main performance is easy to be emotional, taciturn and always thinking about things. In some cases, even people with more severe depression have suicidal thoughts.

Extended data:

Many people find that they are easy to feel happy on sunny days, but they are always depressed when it rains. When the air pressure is low, the situation is just the opposite. The oxygen content in the air is low, the sympathetic nerve is at a low tide, and the body easily feels uncomfortable.

Japanese experts pointed out that the actual weather affects people's emotions through air pressure, because the "autonomic nerve" that regulates people's emotions has a deep relationship with "air pressure".

When the air pressure is high, the air flows around from the center, and the high-altitude air sinks and supplements, constantly generating downward airflow, and the air is squeezed and the temperature rises. It is difficult to form water vapor, so it is mainly sunny when the air pressure is high. At this time, the oxygen content in the air is high, which can fully supply the burning energy, excite the sympathetic nerve, and people's activity intention is obviously positive.

When the air pressure is low, the situation is just the opposite. The oxygen content in the air is low, the sympathetic nerve is at a low tide, and the body easily feels uncomfortable. So there was "rainy day depression".

Baidu encyclopedia-rainy day depression