It was a difficult year for Spears, who said earlier this month that she "took the time" to focus on her self-care.
At the time of their posting, People and other outlets reported that the star had checked in at a facility to seek "comprehensive wellness treatment."
In January, the singer said she is withdrawing from her career and residing in Las Vegas to help her father, who deals with health issues.
She referred to her family's personal struggles in a message to her followers earlier this week after speculating about the pop star's absence in the limelight.
"My family has been through a lot of stress and anxiety lately so I just needed time to act," Spears said on Instagram.
She added, "You may not know anything about me, but I'm strong and stand for what I want!"
Spears asked for a bit of privacy to cope with all the harsh things that life offers me, claiming she would return "very soon".
Spears later posted a video in which she trained herself, and said lightly, "Who knew stress would be a big weight loss of 5 pounds, Yay for me."