<s>[INST] hi ,im 21 and i recently noticed two lumps  in  both my breasts just under the skin , my doctor told me its  bilateral  fibroadnosis and the lumps move when touched , my doctor told me not to worry but im still worried , what is this disease in simple terms and does it cause cancer ? [/INST] Hi.Fortunately such lumps never cause a cancer. So no worries , please . IF the lumps are round and move easily under the skin and are painless- they are fibroadenomas- can not cause cancer. It the lumps are diffuse, ill-defined and cause pain prior to periods , they are fibroadenosis. These also Do NOT cause cancer. But cause pain and discomfort.If you still have doubts - you can go for a simple test of FNAC - fine needle aspiration cytology for confirmation or get them  removed. </s>