A symptom is something the patient senses and depicts, while a sign is something other individuals, for example, the specialist take notice of. To give an example, enlarged pupils can be a sign, whilst sleepiness can be a symptom.
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)
Drug addiction can lead to strong cravings. The person addicted may be willing to stop taking it, but they are not able on their own.
Personal circumstances, genetics, and the specific substance being used are all things that can determine how the signs and symptoms of abuse will manifest in an individual.
Some signs and symptoms of abuse could be:
Those who are addicted to alcohol and drugs on a technical manner may be exposed to the aforementioned dangers, but the severe urge to consume drugs and the withdrawal symptoms witnessed by an addict may not be present.