Breast augmentation is an operation to increase breast volume and improve breast shape, most commonly using implants. People usually consider it because they have always felt their breasts are small for their frame, because volume has reduced after pregnancy or weight change, or because of noticeable asymmetry.
The starting point is not choosing an implant size. It is understanding what matters to you, assessing your anatomy carefully, and working out what is likely to look proportionate and feel right for your body. In some cases, an implant is the right solution. In others, where the main issue is droop rather than lack of volume, a breast uplift may be more appropriate.
The aim is a measured, natural-looking improvement rather than a one-size-fits-all result. No operation can create perfection or permanent symmetry, and good planning is as important as the operation itself.