Do you ever feel happy one minute and then sad the next? That's called a mood swing. Sometimes our emotions can change very quickly without any obvious reason. It's like being on a big rollercoaster, going up and down and all around.
Mood swings can happen to anyone, even grown-ups. They can be caused by different things, like hormones (which are chemicals in our bodies that affect how we feel), or things happening in our lives that upset us or make us excited.
It's important to remember that it's okay to have mood swings, and that they will usually pass in time. If you feel like your mood swings are happening a lot and getting in the way of your daily life, it might be helpful to talk to someone you trust, like a parent or a teacher, about how you're feeling. They can help you figure out ways to manage your emotions and feel better.