The singer broke her silence with a message to her fans on Instagram following her release from the hospital last weekend.
"I have always been transparent about my journey with addiction," she began her message on Sunday. "What I've learned is that this illness is not something that disappears or fades with time. It is something I must continue to overcome and have not done yet."
She later wrote, "I now need time to heal and focus on my sobriety and road to recovery. The love you have all shown me will never be forgotten and I look forward to the day where I can say I came out on the other side. I will keep fighting."
Following her overdose, a source told E! News that Lovato had made the decision to go to rehab because "she wants to make a statement to her fans, family and friends that she is strong and can recover."
"Demi knows she needs help," the insider added. "Her family has told her that this is the time to be a good example to her fans."
While another source shared with E! News, "She is scared and grateful to be alive. Her family hasn't left her side and have consulted with several people to figure out what the best plan of action is. Everyone wants her to take it very seriously and she seems to be."