As an adjective:
* The news of the accident upset her deeply.
* He was upset to hear that his team lost the game.
* The little girl was upset when she lost her favorite toy.
As a verb:
* The loud noise upset the baby.
* Don't let their negativity upset you.
* The sudden change in plans upset everyone's schedules.
In a phrase:
* She was upset about missing the party.
* The children were upset with each other after the argument.
* He was upset at the unfair treatment he received.
Note: "Upset" can also be used as a noun to refer to a state of being distressed or troubled, but this is less common.