Could yellow discharge from the nipple be breast cancer?
If the nipple discharges yellow fluid accompanied by other typical symptoms of breast cancer, it may indicate breast cancer; if only the nipple discharges yellow fluid, it may not be breast cancer. It is recommended to visit a hospital to determine the cause and follow medical advice for treatment. Detailed analysis is as follows:

Breast cancer may cause nipple discharge, especially unilateral nipple discharge, which might appear yellow or brown, and sometimes even contain blood. If nipple discharge is accompanied by other typical symptoms of breast cancer, such as breast lumps, skin indentation, nipple retraction, or swollen axillary lymph nodes, prompt medical attention and further examinations are necessary.
If only yellow fluid discharge from the nipple occurs, it could also be a sign of mastitis. Mastitis may be related to autoimmune diseases, infections, trauma, or other factors, and can present as breast lumps, pain, and nipple discharge.
Additionally, before seeking medical care, it is important to maintain nipple hygiene and avoid squeezing the nipple to prevent worsening symptoms. You should also observe the characteristics of the yellow discharge, such as its color, volume, and odor, and keep a record to provide detailed information to the doctor.