Lump in One Breast Before Your Period

Breast tissue can feel fuller, firmer, or more tender as hormone levels change during the menstrual cycle. A fluid-filled cyst or other non-cancerous breast change can also feel like a distinct area. A lump that becomes less noticeable after the period is useful information, but that pattern cannot identify its cause by touch alone.

Notice whether the area is new, whether it moves under the fingers, and whether the skin or nipple has changed. A breast lump is a common presentation of breast cancer, but many breast lumps have non-cancerous explanations. An examination is the way to sort these possibilities.

Check the area once, gently, rather than repeatedly pressing it. Record when you noticed it, where it is, whether it changes with your cycle, and any tenderness or discharge. Arrange a breast assessment if it remains after your period, grows, or feels different from the surrounding tissue. Bring your menstrual dates and any family or personal breast history to the visit.

Seek prompt medical care for a lump with redness, warmth, marked swelling, fever, or feeling unwell, because infection may need treatment. Arrange timely assessment for a hard or fixed area, dimpling, nipple inversion, bloody discharge, or a lump in the armpit. Do not wait for the next cycle if the change is rapidly worsening.

Ask whether the lump needs imaging, what features were found on examination, and whether you should recheck it after your period. Ask what changes should prompt an earlier review and how to monitor the area without irritating it.