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Thursday, October 29, 2009 Krissy, Community Member, asks

Q: Why is my right breast suddenly larger?

A week ago I started noticing my right breast growing larger...It is now about a cup size bigger then the left. It isn't really pain as much as it is an odd discomfort an some tenderness. I'm not worried about it being cancer as much as I just want to know what is going on. Im only 18 and its starting to worry me. This morning when I woke up there was a bruise along the top portion of my right breast. What could cause this?

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Answers (1)
Phyllis Johnson, Health Guide
10/30/09 6:12am

A difference in breast size is not uncommon, and at eighteen, your breasts might still be growing, but at an uneven pace.  You could be having swelling associated with your menstrual cycle or pregnancy that for some reason is affecting one breast more than another.  The swelling is probably what is leading to the discomfort and tenderness.  Swelling can also be a symptom of an infection or a rare type of breast cancer called inflammatory breast cancer.  

Since this is a sudden change in your breasts, you will probably need to call a doctor to get it checked out.  If it is near time for your period to start, you could wait to see what happens after your period.  Many women have breast swelling and tenderness in the week or two before their periods, and it's not always even.  If the swelling goes down, wait another month and see what happens.  This may turn out to be part of your monthly cycle.  If the swelling does not go down after your period, call the doctor.  The cause is probably not dangerous, but you'll feel better once the doctor has checked it out.

cher, Community Member
3/15/11 8:45pm

I am almost 30 years old and my left breast suddendly grew larger then my right.  It feels firm and it bounces more then normal.  What does this mean.  This has never happened before and I am well past my teens.

PJ Hamel, Health Guide
3/15/11 9:46pm

Since it's noticeably larger, and feels firm, it sounds like there's some swelling there. This is something you'd want to consult a doctor about; you might have an infection, especially since it happened so suddenly. Best to call the doctor and make an appointment ASAP, OK? Take care- PJH

Phyllis Johnson, Health Guide
3/15/11 10:11pm

I agree with PJ.  A sudden, dramatic change like this needs a doctor's attention.  It may be a minor problem, but you will feel better once a doctor has checked you out.

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By Krissy, Community Member— Last Modified: 03/15/11, First Published: 10/29/09