An explosion in a dream is often a way of releasing repressed negative emotions, such as anger or fear.
If you dream of an explosion, you may have been holding in negative feelings because you are afraid that expressing them could cause a great deal harm. However, you have reached a point where you are afraid that you may not be able to control them any longer.
Your dream is telling you that you should think about what is causing you to have these emotions, and to try to find a safe, productive ways to deal with them. If somebody is causing you to become angry or frustrated, perhaps you can speak to them in a calm way and see if they can change their behavior so that it is less upsetting to you.
If that is not possible, you may want to speak to a third party, such as a counselor, or even write down your feelings in a diary or journal. You may find that the thing that has been bothering you so much isn’t really that important after all.
Dreaming that you are injured in a sudden explosion can mean that you have received a sudden shock in real life.