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Ask an Expert: When is nipple discharge a concern?

Q: “I am concerned about some discharge from one of my breasts. If I squeeze the nipple, I get a dark greenish fluid. Sometimes it also occurs spontaneously. I mentioned this during my last physical exam, but my mammogram appeared to be OK. Should I do anything else, or just wait for my next mammogram? If it’s nothing to be concerned about, what is causing it?”