Specific Signs of Drug Abuse

People who abuse drugs undergo changes to their health and mental well-being. Signs of drug abuse can range from anxiety to shifts in behavior. These can depend on the type of drug used and whether the person has developed a dependency. It's common for drug abusers to try to hide their substance abuse. If you are concerned that a loved one is using drugs, knowing the warning signs can help you reach out and seek help.

Behavioral Changes

• Teens will develop a shift in personality when abusing drugs.

  Marijuana can induce paranoid behavior in users, while stimulants such as cocaine can cause users to have explosive speech, notes the Mayo Clinic. Your loved one can become distant or hostile when approached about possible drug use. Mood changes, irritability, becoming secretive or silent can also be signs of drug use. Teens who abuse drugs may develop forgetfulness, have a drop in grades or skip classes. Teens can also develop "new" friends and will avoid discussing those with whom they hang out.

Physical Changes

• Marijuana has an odor you can smell on the person.

  Physical signs can include shifts in appetite, changes in the shape of the pupil, bloodshot eyes and sleep changes, indicates the U.S. National Library of Medicine. Heroin users will have noticeable needle marks on their arms, legs or even their feet. If your loved one begins to see things that aren't there, this is a sign of hallucinogenic drug use. If you notice unusual smells on the person's clothing or breath, this is also an indication of drug use. Hyperactive behavior, tremors, weight loss and skin flushing can be signs of amphetamine use, states the U.S. National Library of Medicine.

Health Changes

• Depression can be caused by various drugs.

  Drug use can cause many effects on the body. Snorting cocaine and meth frequently can lead to nosebleeds. A runny nose not caused by allergies or illnesses can indicate inhalant use, such as sniffing glue. Cottonmouth, where excessive lip licking is noted, can indicate marijuana or Ecstasy use. Drugs such as PCP, cocaine and barbiturates can cause depression. If you notice that your loved one has open sores on his mouth or if he picks at his skin, this can indicate meth abuse.

Other Changes

• Using mints to cover up bad breath can mean drug use.

  Alcohol intoxication can include flushed cheeks, slurred speech and an inability to focus. If your loved one chews gum constantly or sucks on mints, she could be trying to cover up her breath. Noticing unusual items left around your house, such as lighters, eye drops or rolling papers are telltale signs. Aggression, sweating, twitching and coughing can indicate heroin and hallucinogenic use, notes the American Council for Drug Education.