Opioid withdrawal is the physical and psychological symptoms that occur when a person stops using opioids after developing a dependence on them. These symptoms can include cravings, nausea, vomiting, diarrhea, muscle aches, anxiety, and insomnia. Withdrawal can be a difficult and uncomfortable process, but it is a necessary step in overcoming opioid dependence and addiction. Treatment for opioid withdrawal typically involves medical supervision and support to help manage symptoms and prevent relapse.