Galactorrhea in women during non-lactating periods may be associated with breast cancer, but this is not absolute. Galactorrhea can be caused by various factors, including physiological and pathological reasons. Here are some possible causes of galactorrhea in non-lactating women:

1. Breast Diseases: Breast conditions such as mastitis, mammary duct ectasia, and fibrocystic breast changes may lead to nipple discharge.

2. Medication Effects: Certain medications, such as some antidepressants, antihypertensives, etc., may cause galactorrhea.

3. Endocrine Disorders: Endocrine diseases such as hypothyroidism and pituitary tumors can lead to abnormal hormone levels, which may result in galactorrhea.

4. Breast Cancer: Breast cancer can sometimes cause nipple discharge, especially when the tumor is located near the large ducts close to the nipple. This discharge may be bloody, clear, or milky.

If a woman experiences galactorrhea outside of the lactation period, particularly if it is unilateral or bloody discharge, it should be taken seriously, and medical attention should be sought promptly for appropriate examinations, such as breast ultrasound, mammography (molybdenum target), or nipple discharge cytology, to rule out underlying conditions like breast cancer. The doctor will provide a diagnosis and recommendations based on the examination results.

Preventing breast cancer from a traditional Chinese medicine perspective:

1. Balanced diet: Eat plenty of fresh vegetables, fruits, whole grains, and legumes, as these foods are rich in fiber and antioxidants, which help maintain physical health.

2. Moderate exercise: Maintain a moderate level of physical activity, such as walking, jogging, yoga, etc., to help regulate bodily functions and enhance immunity.

3. Emotional management: Maintain a positive emotional state and avoid excessive stress and mood swings, as traditional Chinese medicine believes that emotional fluctuations can affect the flow of qi and blood.

4. Regular Check-ups: Perform regular breast self-examinations and follow your doctor's recommendations for breast screenings, such as breast ultrasound, mammography, etc.

5. Traditional Chinese Medicine (TCM) Regulation: Under the guidance of a TCM practitioner, you can use certain Chinese herbal medicines that are known to regulate qi and blood, soothe the liver and relieve depression, strengthen the spleen, and benefit the kidneys.

Foods suitable for preventing breast cancer:

1. Leafy Greens: Such as spinach, bok choy, and celery, which are rich in vitamins and minerals.

2. Fruits: such as citrus fruits, apples, blueberries, etc., are rich in antioxidants.

3. Whole grains: such as oats, brown rice, whole wheat bread, etc., are rich in fiber.

4. Nuts and seeds: such as walnuts, almonds, sesame seeds, etc., contain healthy fats and trace elements.

5. Legumes: such as soybeans, mung beans, red beans, etc., contain phytoestrogens and soy isoflavones, which may help regulate hormone levels.

6. Fish: Rich in Omega-3 fatty acids, which help reduce inflammation.

Please note that the above suggestions cannot replace professional medical advice. If you have any health concerns, please consult a doctor or a Traditional Chinese Medicine practitioner.