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.
Substance dependence is when someone is addicted to a something like drugs or alcohol and they are not able to control their use of the substance. Even if the substance poses a danger, they will still take it whether or not they know the dangers.
Substance reliance can bring about effective yearnings. It's possible that the addict wants to stop taking the substance but finds it really hard to do so on his or her 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 signs and symptoms of abuse could be:
Certain alcohol or substance abusers who aren't technically addicted might also be affected by or cause a few of the above-mentioned descriptions, though these abusers don't generally experience the withdrawal symptoms of addicts or the exact same obsession to use the substance.