A sign is something others, like the doctor, see, whilst a symptom is something that the patient discerns and explains. For example, drowsiness could be an indicator, but enlarged pupils are clues.
Drug addiction - when an individual is dependent on a substance, like a drug, nicotine or alcohol, he/she is unable to manage his/her use of that substance. Though these may be dangerous to them, they go ahead with alcohol consumption (the possible dangers may or may not be clear to the person)
Substance reliance can bring about effective yearnings. It will be extremely difficult for the addict to stop using the substance without external assistance, even when they want to.
The signs and symptoms of substance reliance change as indicated by the individual, the substance they are dependent on, their family history (hereditary qualities) and individual conditions.
Some signs and symptoms of abuse could be:
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.