Breast lift, also known as mastopexy

is used to recreate the appearance of more youthful breasts by raising the breast and tightening the skin around it.  it will address sagging breasts, drooping nipples and stretched areolas (the darker area surrounding the nipples), recreating a youthful shape. A breast augmentation or breast reduction might be recommended in addition to a lift.

Your breasts will have an improved shape and a youthful appearance.
You will look better in and out of clothes and feel more self-confident. 
A breast lift leaves scars that will be hidden in a bra or swimsuit.The effects of a breast lift might slowly diminish over time because of gravity and aging.

you might consider a breast lift if pregnancy, nursing, gravity, weight gain or loss, normal aging, and heredity have taken a toll on the shape of your breasts, resulting in sagging.

A breast lift is performed under general anesthesia or intravenous sedation

different techniques will be suggested for each patient situation , depending  on your breast size and shape, areola size and position, degree of breast sagging, skin quality and elasticity and how much extra skin you have.

During your mastopexy the excess breast skin is removed  and the nipple and areola will be shifted to a higher position. if your areola has become stretched, it can now be reduced in size.

Your surgeon will remove excess skin and close your incisions, tightening the skin, sewing the breast back together and placing sutures deep in the breast tissue to support the new breast position for a longer period of time.
Scars are usually hidden under the breasts, although some light scarring may be seen on top of the breast.
The nipples and areolas remain attached to underlying mounds of tissue, and this usually allows for the preservation of sensation and the ability to breast-feed.
In some patients, it may be possible to avoid the horizontal incision beneath the breast as well as the vertical incision that runs from the bottom edge of the areola to the breast crease. If you are a good candidate for a modified technique, your plastic surgeon will discuss this with you.

Here is a description of the different incision patterns and techniques that your plastic surgeon will choose from:

The “anchor” incision, made around the perimeter of the areola, vertically down from the areola to the breast crease and horizontally along the breast crease,  It is for women with a severe degree of sagging who will not be helped sufficiently by less invasive techniques.
The “lollipop” lift, also known as a “keyhole” incision, made around the perimeter of the areola and vertically down from the areola to the breast crease, is suitable for women with a moderate degree of sagging who will not be helped sufficiently by the periareolar technique and who do not want breast implants.
The “donut” lift, also known as the “periareolar incision,” made around the perimeter of the areola only, is suitable for women with a mild-to-moderate degree of sagging. When used by a skilled surgeon in conjunction with the placement of implants, it can produce a satisfactory result for patients with more pronounced sagging.
The “crescent” lift, which is less commonly used, is an incision that lies just along the upper half of the areola. A crescent-shaped piece of skin is removed above that line, and the surrounding skin is reattached to the areola. This type of lift is usually done in conjunction with breast augmentation in women with minor sagging. It cannot accomplish the same degree of lifting as the other incision techniques.
The “scarless” lift. For a select few women concerned more about volume loss than actual sagging, there are procedures to lift the appearance of the breast that are touted as scarless.