The breasts

Breasts are made up of:

• fatty tissue
• supportive (connective) tissue
• glandular tissue containing lobes.

The lobules are also called milk glands. They are where breast milk is made. They connect to the nipple by a network of fine tubes called ducts.

The tissue of the breast extends into the lower armpit (axilla). This area contains lymph nodes (glands). Lymph nodes are part of the  lymphatic system, which protects us from infection and disease. and disease. 

Side view of the breast

Normal changes to your breasts

It is common for your breasts to be a different size or shape from each other. If you have periods, you may notice your breasts change at different times of the month.

Breasts also change during pregnancy and the menopause. These changes are linked to the different levels of the hormones oestrogen and progesterone. These hormones are made in the body.

Before your period, your breasts may feel tender and lumpy. During pregnancy, breasts go through a lot of changes. After the menopause, when the body makes less oestrogen, breasts may change in size and feel softer or less full.

It is important to be aware of how your breasts feel and look at different times. You should know what is normal for you.

A lump in the breast is the most common symptom of breast cancer. Most breast lumps are not cancer, but should always be checked by a doctor.

Ductal carcinoma in situ (DCIS) usually has no symptoms. It is usually found through changes seen on a mammogram. DCIS is the earliest possible form of breast cancer. 

Always contact your doctor if you notice anything unusual for you, or if there is something you are not sure about.

We have more information about the signs and symptoms of breast cancer.