Drug addiction is a disease that impacts brain functioning and behavior in fundamental ways. Over time, repeated use of an addictive substance can lead to an inability to stop using the drug, causing noticeable changes in priorities, behavior, and appearance. Signs that someone is abusing drugs include behavioral changes like loss of interest in activities, withdrawal from family, mood swings, and decreased performance at work or school. Other signs are physical, such as changes in sleeping and eating habits, poor hygiene, shaking, slurred speech, or poor coordination. Commonly abused drugs also cause more specific symptoms. Recognizing the signs of drug abuse is important for getting help and avoiding addiction and other negative consequences.
