Your doctor will first do a mammogram, or an ultrasound, if you’re younger. She might be able to evaluate your breasts from the shape, density, and other signs from the images.
If she needs more information to decide, she’ll do a biopsy. This means getting a sample of your breast tissue. It’s usually done in an office or clinic with a needle. Some women need surgery.
The biopsy will show if a lump is a cyst or solid. It’ll tell your doctor if the growth is cancerous.