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Risk factors
By Mayo Clinic staffFactors that may increase your risk of mammary duct ectasia include:
- Smoking. Women who smoke have an increased risk of mammary duct ectasia. The use of nicotine has been shown to cause abnormal changes in the milk ducts of the breast. The longer you've smoked, the higher your risk of mammary duct ectasia.
- Number of pregnancies. The more pregnancies you've had, the higher your risk of mammary duct ectasia.
Mammary duct ectasia does not affect your risk of breast cancer.
