Lavigne, 30, is said to have admitted to a fan in December that she suffered some health problems.
She, however, chose not to speak about them but tweeted to her supporters that time, "Thank you to all the fans for the sweet get well messages and all the tweets. I appreciate the lovely notes and well wishes from everyone."
The 'Complicated' hitmaker appears healthy in the video of the new song, which is from her self-titled fifth studio album, reported Us magazine.