Increasing breast size is one obvious reason why women undergo breast enhancement, but there are a lot of other reasons. For example, breast implants may be used to balance out the appearance of breasts that develop asymmetrically. And, after breast development, a whole new set of factors can all contribute to changes in breast size and shape.
Droopiness, or sagging, of the breast is called breast ptosis. It’s a completely normal thing to happen to breasts as a result of ageing and childbirth. Ptosis can be corrected with a breast lift (mastopexy), which is sometimes combined with implants.
Breast implants are also an option for women who need reconstructive surgery following mastectomy for breast cancer.