The desired result has been achieved before reaching any limits.
You don’t have enough fat present in the area being treated
The area being treated starts to bleed excessively.
It can be hard to predict in advance how much fat will come out. Sometimes it is possible to remove a very large amount of fat from relatively lean individuals. Conversely, it can sometimes be surprisingly difficult to remove fat from an individual who looks like they have enough it they don’t.
There may be excessive amount of scars.
Very uncooperative patient.
Patient discloses medical history that was not disclosed prior to surgery e.g bleeding disorders