Many people think that it means that someone is sad or angry, but it is different from both of these words. Basically, to be upset means to react to a negative situation in a very emotional way. For example: ... Sadness is a very internal feeling in which we don't show strong emotions.

Does Upset mean sad and mad?

To be upset is to be mentally unsettled, moved out of your mental or emotional comfort zone by something. The resulting emotions from the upsetting stimulus could be sadness, frustration, hysteria, and/or anger. By contrast, being "mad" implies one singular emotion, anger.

What is the difference and be sad or upset?

I think sad generally means "sorrowful" and tends to be a rather quiet, sort of "internal" state, one that can last for some time. Upset, on the other hand, usually refers to a more temporary, active state, often related to anger, unease, or confusion.