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A member asked:

Started birth control a week ago, lately my breast have been really sore. took plan b 2 days ago. is this why their hurting?

A doctor has provided 1 answer
Dr. Carla Enriquez answered

Specializes in Pediatrics

Probably : Yes large doses of estrogenic compounds can cause mastodynia (sore breasts). But you note you're 4 weeks pregnant. If that is true, of course the pregnancy can cause mastodynia.

Answered 12/10/2013

5.1k views

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