The punk pop group announced the shock news about their drummer via their GOODCHARLOTTE.COM website, but the statement doesn't go into details about Wilson's health problems.
The group writes, "We have made a collective decision to have Chris stay around his friends and family and begin to truly rehabilitate.
"This has not been easy on any of us. We loved playing with Chris so much. We hope everyone will be respectful and understand the situation and pray that Chris gets better."
Wilson became Good Charlotte's regular drummer in 2002 for the recording of their hit album THE CHRONICLES OF LIFE + DEATH.
The group have yet to announce who Wilson's full-time replacement will be, but Alkaline Trio drummer DEREK GRANT has been performing with the hitmakers during shows Wilson was too sick to attend.