Signs of painkiller addiction include smaller pupils, itchy skin, vomiting and constipation, according to the National Institute on Drug Abuse. Physical signs of narcotic painkiller addiction include respiratory depression, analgesia, sedation and slurred speech, states WebMD.
When a person has a painkiller addiction, they suffer from drug dependence and have a psychological need for the drug, states WebMD. Often, this need results in personality changes, such as outbursts and secretiveness.
Psychological signs of pain killer addiction include doctor shopping whereby the patient secretly visits several doctors in order to get as many painkiller prescriptions as they can, explains the National Institute on Drug Abuse. Painkiller addicts crave the medications a lot, and they often take more than their doctor prescribes, according to WebMD.
Painkiller addicts may get prescription painkillers from other sources such as buying from the Internet, stealing from sick relatives or intentionally hurting themselves so that they can get a new prescription from the emergency room, notes WebMD. Most addicts start taking painkillers when they are hurt, but they continue taking them long after the pain is gone.
Mood symptoms of painkiller addiction include mood swings and euphoria, according to The Refuge. Psychological symptoms include depression, anxiety, psychosis and worsening mood states.