The observable indications of meth use include: talkativeness and rapid speech, hyperactivity, irritability, agression, restlessness, inability to sleep, decreased attention span, sexual promiscuity, and violent behavior.

Meth users may exhibit other symptoms as well, among them: loss of appetite, heavy perspiration and body odor, teeth grinding, bad breath, body tremors, scratching of sores, dry lips and mouth, bleeding nose, and dilated pupils.