The biggest cause of stress is social pressure. In fact, every issue we are stressed about is based on the pressure in society. The stress of getting a good degree in a good university, the stress of marrying a good-looking person with the perfect wedding, the stress of achieving the ideal appearance, and many other things are caused by society. Of course, these are not bad things, but they are not things people decide for themselves. I attribute this pressure to the reason why people are stressed about the things they should be happy about.