I had a friend of mine wrote to me and asked if there are physical symptoms that a Meth user displays while using. She thinks her son may be addicted to Meth. I have compiled several physical symptoms to look for. Insomnia (staying up for an extended period of time) Lethargic behavior (sleeping for an extended period of time following bouts of insomnia) Increase in activity and decreased appetite Confusion Irritability Repetitive facial movements or jaw clenching Dilated pupils Shakiness Nose Bleeds Dry Mouth and persistent thirst Dehydration This is what I have come up with so far, much from personal experience. If you guys can think of anything else please add to the list. She is now working on a plan to confront her son about her suspicions. I have actually referred her to this forum, as many of you have valuable advice and experience to share. Thank you all so very much!