What are the risks in having breasts up-lifted (Mastopexy)?

As with any major operation under general anaesthetic, there is a
small risk of chest problems particularly if you are a smoker and a small
risk of thrombosis of veins in your legs, particularly if you are taking a contraceptive pill. In addition there is a small risk of one of more of the
following complications...

Rarely heavy bleeding from the broken blood vessels can occur after the operation, which requires treatment in theatre under another anaesthetic. Occasionally, infection (usually from germs that are lying dormant in the ducts of the breast) can cause part of the wounds to break down which prolongs the healing period and worsens the quality of the final scars.