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addiction is a state in which the body relies on a substance for normal functioning and develops physical dependence. It is a term that is specifically applied to drug addiction. When the drug or substance on which someone is dependent is suddenly removed, it will cause withdrawal, a characteristic set of signs and symptoms. Addiction is generally associated with increased drug tolerance. In physiological terms, addiction is not necessarily associated with substance abuse since this form of addiction can result from using medication as prescribed by a doctor.

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Addiction is a physical or psychological dependence on a substance or behavior. In medical terms, it is the result of the body being unable to maintain a normal state without use of an artificial substance.

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Addiction is a dependence.
It may be physical or psychological. Many people do not realize
their dependency until Symptoms of withdraw are experienced. 
These symptoms of withdraw are experienced when the substance or
behavior is with held.

Physical signs of withdraw include but are not limited to
Sweating
Racing heart
Palpitations
Muscle tension
Tightness in the chest
Difficulty breathing
Tremor
Nausea, vomiting, or diarrhea

Emotional symptoms of withdraw include but are not limited to   
Anxiety
Restlessness
Irritability
Insomnia
Headaches
Poor concentration
Depression
Social isolation