1. Irritability – When someone you know is struggling with an addiction to drugs, they tend to become easily irritable and angry. Their emotional state changes quickly and a bipolar disorder can become apparent. Negative behavior can be a sign of addiction.

2. Absence – If the person’s schedule has changed significantly and the person is absent much more often, this could possibly be a sign of drug abuse. In a teenager, this sign alone may not necessarily be a drug addiction. However, combining irritability and absence from school and other mandatory activities could pose an issue.

3. Body language – Fidgety behavior and muscle spasms are sure signs there could be a drug addiction problem. An inability to sit or stand still and a constant movement of the hands can show either recent drug use or a withdrawal. Discussing the situation with the person in order to find help is important and should be considered if any of these symptoms appear to be happening.

While behaviors can be a dead give away of addiction, physical symptoms can also be a sign of addiction. While these symptoms mentioned below may not necessarily be related to addiction, they can be signs of a problem.

1. Tics – Involuntary muscle movements can be a sign of drug abuse. Usually a symptom of withdrawal, tics can be slight muscle spasm or an inability to sit still. The body and mind become irritated when on certain drugs or suffering from the withdrawal of certain drugs, which leads to these involuntary movements.

2. Bloodshot eyes – Bloodshot eyes can often be a sign of drug addiction. The eyes in general can be an effective window into addiction. Eyes are easily affected by certain drugs, causing the pupils to dilate, for them to tear constantly or to dry out can become red.

3. Nausea – Nausea is another symptom that usually surfaces during withdrawal. The body tends to reject unhealthy things and its response can often be nausea once the high has left. The body can also show its addiction to a drug through the feeling of nausea when the body has been without the drug for an extended period.