What are the possible causes of occasional mild pain inside the left breast?

Patient's question:

Female; 34 years old, underwent a breast ultrasound examination during ovulation in late October of this year. The results are as follows:
A hypoechoic area was detected in the outer upper part of the left breast, approximately 1.10.60.4 in size. The mass had discernible boundaries but an irregular shape, with inhomogeneous internal echoes. Scattered punctate and small patchy hypoechoic areas were observed in the remaining glandular tissue, also inhomogeneous. No blood flow signals were detected in or around the hypoechoic areas. The blood flow distribution in the remaining glandular tissue was normal.
An elliptical anechoic mass was detected in the upper lobe of the right breast, approximately 0.80.8 in size. The boundaries were clear and regular, with good transmissibility and enhanced posterior echoes. Scattered punctate, linear, and small patchy hypoechoic areas were observed in the glandular tissue, also inhomogeneous, but no obvious masses were seen. The blood flow distribution was normal.
No obvious mass echoes were detected in either axilla.

Doctor's answer:

Breast tenderness can be physiological or pathological. During the premenstrual period of women (due to hormonal changes after ovulation), tenderness and pain upon touch are normal. If the symptoms are severe, irregular, or accompanied by localized breast lumps, it falls under the pathological category and requires medical attention. You should visit the surgical department or a specialized breast clinic for ultrasound and mammography examinations to diagnose and treat the condition.

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