Why do some people vomit when they are angry or sad, while others remain silent?

Because those who complain are usually those who are weak-willed, weak-hearted, selfish (just want to pass on their negative energy to others), and want others to pay attention to themselves. People who remain silent mainly depend on individuals. Some people endure it silently (this is not advisable), and some people know how to adjust and deal with it on their own (such people can achieve great things).