Opioid withdrawal occurs when a person who has been using opioids regularly suddenly reduces or stops their intake. This can happen after prolonged use of prescription painkillers, such as morphine or oxycodone, or illegal drugs like heroin. Symptoms typically begin within hours to a few days after the last dose and can include anxiety, muscle aches, sweating, and nausea. The severity and duration of withdrawal symptoms can vary based on factors like the type of opioid used, the length of use, and individual health. While withdrawal can be uncomfortable, it is generally not life-threatening. Medical support can help manage symptoms and aid recovery.