What is a symptom that may indicate the presence of breast cancer?

Discharge from the nipples is a symptom that can indicate the presence of breast cancer, particularly when the discharge is bloody or clear and occurs without any obvious cause. This symptom can raise concern as it may arise from underlying issues related to the breast tissue, including the potential for malignancies. Abnormal changes in nipple discharge, especially if accompanied by other symptoms like a lump in the breast, changes in breast shape or size, or persistent pain, warrant further evaluation by a healthcare professional.

The other options presented typically do not correlate with breast cancer. Blurred vision is more commonly associated with issues related to eye health or neurological conditions, while increased appetite could result from a variety of non-cancer related factors such as metabolic changes or emotional states. Muscle spasms are generally linked to muscular or neurological conditions rather than cancer. Therefore, the focus on nipple discharge as a potential indicator of breast cancer is crucial for early detection and intervention.