i got the same thing from tren. Ran it for a few eeks, then BAM, gyno! I got some cabaser w/ nolvadex, and the went away enough to where i can live with it. Sucks cause i liked tren, and never tried deca. IMO it's definately from deca, especially if you've used test at med-heavy doses and didnt get any from that. Grab the anti-p, and if you can, get some cabaser.