[Sullivan]

There IS a phenomenon called breast hypertrophy, in which one or both breasts grows very rapidly - on the order of a cup size in a few days. Most cases are associated with pregnancy, but not all.

I wonder about the report of a "hard mass". It seems from the report that it's the entire breast? That's not how real breasts work. Real breasts are partly fat, partly mammary glands. The latter could be described as "hard" (certainly harder than the fat they're in, but do NOT squeeze them to find out how hard they are!) and are sort of distributed around in the fat, connected to the nipple by milk ducts.

The non-hardness of the fat is what gives the breast its overall squishyness, and is why push-up, push-together, etc., bras can do what they do.

One huge hard mass sounds more like an implant And about as desirable.