With reference to drug/alcohol abuse:
a) Addiction: After continuous substance abuse, there is a marked change in behaviour due to the biochemical changes in the brain and the other systems in the body. Over-usage of these substances is detrimental to the body. The usage gives a feeling of well being which is temporary but forces a person to use the drugs or alcohol even when not needed. This is known as addiction.
b) Dependence: Dependence on a drug happens because of the inherent addictive nature of the substance. Dependence is the psychological attachment that patients develop to the drug in such a way that they are unable to function or live without them.
c) Withdrawal symptoms: Withdrawal symptoms occur when the drug/alcohol intake by an addicted person is discontinued abruptly. It is characterized by anxiety, nausea, sweating, panic, etc.
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