Winehouse was previously treated by medics in November (09) after experiencing complications following her breast enhancement the previous month (Oct09), and the singer is now said to be waiting for a decision on whether she needs to have the implants removed.
A source tells The Sun, "Amy was in agony and became convinced it was something to do with her boobs. She thought she would leave it for a while but the pain got worse. She went into the clinic on Thursday and they kept her under observation.
"She is waiting for a decision on whether the implants have to come out or not. Amy loves her curves and would hate to have to have them taken out. She is still her bubbly self but she is worried."