The causes of breast milk discharge in women who are not pregnant:

Hormonal Imbalances
1. Prolactin imbalance: Elevated levels of prolactin, a hormone that stimulates milk production, can cause breast milk discharge.
2. Thyroid disorders: Certain thyroid conditions, such as hypothyroidism, can cause hormonal imbalances that lead to breast milk discharge.

Medications
1. Hormonal birth control: Certain types of hormonal birth control, such as birth control pills or patches, can cause breast milk discharge.
2. Antidepressants: Some antidepressant medications, such as selective serotonin reuptake inhibitors (SSRIs), can cause breast milk discharge.

Medical Conditions
1. Galactorrhea: A condition characterized by excessive milk production, often caused by hormonal imbalances or certain medical conditions.
2. Pituitary gland problems: Certain conditions, such as a pituitary tumor, can cause hormonal imbalances that lead to breast milk discharge.
3. Breast cysts or tumors: Benign or cancerous growths in the breast tissue can cause breast milk discharge.

Other Causes
1. Stress: Chronic stress can cause hormonal imbalances that lead to breast milk discharge.
2. Breast stimulation: Frequent breast stimulation, such as through massage or nipple play, can cause breast milk discharge.

Symptoms
1. Spontaneous milk discharge: Milk discharge from the breast without any apparent cause.
2. Breast tenderness: Pain or discomfort in the breast tissue.
3. Nipple discharge: Discharge from the nipple, which may be clear, white, or yellowish in color.

Diagnosis
1. Physical exam: A healthcare provider will perform a physical exam to assess the breast tissue and nipple discharge.
2. Hormone level tests: Blood tests may be used to check for hormonal imbalances.
3. Imaging tests: Mammograms or ultrasounds may be used to evaluate the breast tissue.

Treatment
1. Hormonal treatments: Medications may be prescribed to regulate hormonal imbalances.
2. Medication adjustments: Adjusting or discontinuing certain medications may help alleviate symptoms.
3. Surgery: Surgery may be necessary to remove breast cysts or tumors.

If you're experiencing breast milk discharge and are not pregnant, it's essential to consult a healthcare provider for a proper diagnosis and treatment.