Breast engorgement means that your breasts are overfilled with milk.
Your breasts becomes larger, heavier, and tender. Some of the fullness is due to extra blood and lymph fluids in the breast tissue.
If your breasts feel uncomfortably full, swollen, warm, throbbing, or painful, they are probably engorged. Your nipples may become flattened and, if the swelling is severe, your breasts may be so full that the skin looks shiny. The swelling may extend all the way to your armpit, and the lymph nodes in your armpits may be tender and swollen. You may even run a low fever.