Ill bite since i asked myself this before
Puffy nipples is the start but that is commonly just fat and water. Somtimes nipple fat doesnt even leave till after lower belly fat so dont be scared too much
It turns into a marbel behind your nipple that is sensitive to touch. Sensitive as in wearing a shirt makes it itchy, thats how sensitive it is. So pinching it will be a fun ride for a test
Then if you squeeze the nipple, you get a gross discharge like a pregnant bitch
These are the progressive stages of gyno
Early symptoms to look for are puffy, sensitive nips