There are physical, behavioral, and emotional warning signs of substance abuse, affecting a person’s body in many, sometimes severe ways. Physical warning signs can include sudden weight loss, skin sores, red and irritated eyes, unusual cuts or bruises, vomiting, nausea, irregular heart rate, seizures, insomnia or irregular sleep patterns, and memory loss. Behavioral warning signs include unusual or erratic behavior, frequent deceptiveness or secretiveness, theft, shirking of important responsibilities such as work or school, dramatic changes in activity level, and sudden changes in social network or friend group. Emotional warning signs include mood swings, emotional volatility, increased aggression, and unexplained depression.