A sign is something others, like the doctor, see, whilst a symptom is something that the patient discerns and explains. Example is the case of dilated pupils being a sign while constant sleepiness is a symptom.
Substance reliance - when a man is dependent on a substance, for example, a medication, liquor or nicotine, they are not ready to control the utilization of that substance. They keep taking it, despite the fact that it might bring about mischief (the individual could conceivably know about the potential damage).
Drug addiction makes the body have a strong desire for the substance. The person addicted may be willing to stop taking it, but they are not able on their own.
The symptoms and signs of drug addiction differ according to the person, the drug they are dependent to, their genetics (family history) and personal situations.
Some of the symptoms and signs of drug dependence can include:
A person, because they indulge in alcohol or drugs may exhibit some or all of the above symptoms and not be certified addicts, but they will not display any of the withdrawal symptoms or the associated craving.