Is the BBL considered a high risk procedure?

Great Question - Mild discomfort in the abdomen and buttock is normal; however, if
major discomfort is experienced in either of or other regions of the
body, following the surgery, than it is important to consult the doctor.
Infection is a risk, but very few cases turn up with infection.
Fat reabsorption is a possibility. Fat reabsorption, in the case of a
Brazilian Butt Lift, is when the buttock absorbs the injected fat more
than intended. The result is typically anywhere from 65 to 85 percent of
the volume transferred during surgery.
There is, also, the risk the results desired are not achieved. This
is particularly true of patients with unrealistic expectations. It is
also true of patients not already living a healthy lifestyle. The
doctor, in such cases, will work with the patient to achieve acceptable
results. The worst complications include medical risks such as organ
injury, blood clots in legs which travel to the lungs, fat entering the
bloodstream and traveling to the lungs, and even death.During your consultation your Board Certified Plastic Surgeon should go over the complications and risks with you. - Best Wishes

It is not a high risk procedure, but most important, please make sure your surgeon is a board certified plastic surgeon.Any surgery has inherent risks i.e. infection, bleeding, unsatisfactory result, etc. It is important that you discuss the possible risks with your plastic surgeon before any procedure. Also, there are risks associated with anesthesia as well,  and you should inquire about these risks as well. If you have any questions , you can check the website for the American Society of Plastic Surgery.

I think that BBL is a very safe procedure, but all surgery has certain inherent risks and your overall health definitely impacts yoru risks.