Meth can give people an excess of energy. They might talk and move around a lot. They might not stop to eat or sleep.
Meth users often scratch their skin, causing sores. They might have burns on their lips or fingers from using a hot pipe.
Meth can cause rapid mood swings. For example, people might seem excited, and then become angry and violent. They might act afraid that someone's out to get them. They might want to kill themselves.