Answered by Shaykh Faraz A. Khan
Question: Is it permissible for a woman to get a breast reduction surgery? If she’s having back problems due to the large size of her breast and her small body frame?
Answer: Assalamu alaikum wa rahmatullah,
I pray this finds you in the best of health and states.
Contemporary scholars allow breast reduction surgery in cases of genuine medical need, such as your situation of back problems (as opposed to for mere cosmetic reasons).
This permissibility is assuming (a) the surgery is normally known to alleviate the back problem and not cause more problems or other harm, and (b) other normally-permissible measures of alleviating the back problems have been tried and prove ineffective.
Also, the procedure would have to be performed by a female (if available).
And Allah knows best.
Checked & Approved by Faraz Rabbani