Can breasts have lumps during menstruation?

　　"Coming of menstruation" in clinical terms refers to the menstrual period. During menstruation, there may or may not be lumps in the breasts.

　　1. No

　　Before menstruation begins, hormonal changes occur in the body, which may cause breast tenderness to some extent, but typically do not lead to the formation of breast lumps.

　　2. Yes

　　Discovering a lump in the breast during menstruation could be due to underlying breast structural issues. Hormonal imbalances may lead to hyperplasia of the breast tissue, resulting in noticeable breast lumps. Additionally, bacterial infections that trigger mastitis could also be responsible; under inflammatory stimulation, breast lumps may develop.

　　It is important to seek timely medical care to determine the exact cause and receive targeted treatment to prevent worsening of the condition.