This can be due to;
1) Fibroadenoma of breast
2) Fibrocystic disease of breast (usually it is on both the sides)
3) Multiple cysts in breast
All the three conditions are benign but an ultrasound or fine needle aspiration cytology may be advised for the confirmation.
Please feel free for your follow up questions.
Chance of cancer is quite unlikely as there is a uniform density change in breast which is quite unusual finding for the cancer. But we work on the highly cautionary side for any breast change; and this is the reason you physician may like to get a fine needle aspiration cytology (FNAC) or aspiration biopsy cytology (ABC) done to categorically rule it out.
It is privilege assisting you.
It means the breast has become dense all over the tissue.
You are welcome.
Night sweats may not be related to it. Heterogeneously dense breast tissue is a term employed where breast tissue has varying density all over. Breast tissue is normally homogenous. This heterogeneous breast tissue is commonly being seen in fibrocystic breast disease, which is a non cancerous disease.