We apodted 3 grown chickens from a friend that had to move. So I have been an adoptive mom for 4 months now, so raising chickens is still new to me. I noticed one of my girls had a swollen right breast about 3 days ago, I was thinking well she is about 3yrs old, maybe cancer? Then I goggled swollen right breast on hens, and this website came up. The answer provided made sense about the stomach being full and should disappear by next day, mine has not? Any suggestions on what to do?