Prehistoric medicine was what people used to do when they got hurt or sick a long, long time ago before modern medicine was invented. Prehistoric people had to find their own ways to heal themselves. This usually involved using plants, animals, natural herbs and berries, and other things from nature to make potions and medicines to try to heal their illnesses or to help with the pain. People would also use natural treatments like putting mud or herbs on their skin, and sometimes methods like massage to try to make themselves feel better.