I am 48 years old, and have had persistent non-spontaneous yellow-ish milky discharge from both nipples, multiple ducts, for many years. Substantial amounts when I squeeze even a little bit (which I didn't do very often--only with breast self-exam every month or two). Then about a month ago I noticed a dark bloody discharge coming out of one duct, left breast (still non-spontaneous, except very occasional very tiny spotting). When squeezed slightly, significant amount of dark blood comes out of same duct. Went immediately for consult with breast surgeon, who sent me for a mammogram and ultrasound. Mammogram showed asymmetric density in left upper outer quadrant. Nothing that correlates with the discharge. Ultrasound showed multiple dilated ducts in left nipple, but no indication of why. Both tests designated as inconclusive. I was told to do a BSGI because of dense, lumpy breast tissue that is making it hard to assess. Bloody discharge persists. A few of other maybe related things--had some hormone work done about three months ago--showed low-normal prolactin levels, high (650-ish) estrodial levels, and very low progesterone levels. I am still ovulating every month. I had a lump removed from left breast about 7 years ago--benign fibroid. So, is bloody discharge that is associated with a malignancy ALWAYS spontaneous? Why so much discharge with low prolactin levels? Is the bloody discharge related in any way to the milky discharge? I'm getting really worried. Thank you!