What should you know about cyst under breast?

A breast cyst is a sac containing fluid that can feel smooth, round, or tender. It may sit within breast tissue or close to the fold beneath the breast. Hormonal changes can affect tenderness and size, but you cannot identify the cause reliably by touch alone.

Many breast lumps are benign, yet a lump should not be self-diagnosed. A clinician may examine both breasts and the nearby underarm area, then recommend imaging. A breast ultrasound can help show whether a lump is fluid-filled or solid and guide the next step.

Arrange an appointment for a new lump, a lump that persists, or a change that concerns you. Note when you first noticed it, whether it varies with your menstrual cycle, and whether there is pain, nipple discharge, or skin change.

Do not repeatedly squeeze or puncture the area. Wear a supportive bra if movement worsens tenderness and use only pain relief that is suitable for you. Keep any imaging appointment, even if the lump becomes less noticeable.

Seek prompt medical care for a rapidly enlarging lump, redness and warmth with fever, marked swelling, nipple discharge that is bloody or spontaneous, skin dimpling, nipple inversion, or a new underarm lump.

Get urgent help if breast pain is severe with feeling very unwell, or if redness spreads quickly. These changes can reflect infection or another condition requiring treatment and should not be judged from appearance alone.

Ask what the examination suggests, whether ultrasound is appropriate, whether the lump needs drainage or monitoring, and which changes should bring you back sooner. Ask how to receive and understand the imaging result.