Breast Lumps That Aren't Cancer: Cysts, Fibroadenomas and Cyclical Breast Pain

TL;DR: Most breast lumps are harmless. Fibroadenomas are common in women in their 20s and 30s, cysts are common from 35 until menopause, and breast pain that comes and goes with your period is very common. You still cannot tell a harmless lump from cancer by feel, so every new lump needs a clinician to check it, usually with an ultrasound if you are under 40.

Finding a lump in your breast can make your stomach drop. Your mind jumps straight to the worst, and for many of us the next thought is how much a scan will cost, how long the hospital queue will be, or whether to tell anyone at all. So let us start with the reassuring part, and then be just as clear about the part that still matters. The NHS puts it simply: most breast lumps are harmless. Two of the most common causes are fibroadenomas and cysts, and breast pain linked to your cycle is very common too. But the same NHS page also says not to try to self-diagnose, and that is the rule this whole post is built around.

Are most breast lumps cancer?

No. Most breast lumps are benign, which means not cancer. Common causes include fibroadenomas, cysts and normal hormonal lumpiness. That is why a lump is a reason to get checked rather than a reason to panic. The only way to know which one you have is an examination and, usually, a scan.

What is a fibroadenoma?

A fibroadenoma is a solid, non-cancerous growth of breast tissue. Breast Cancer Now describes it as a smooth lump that moves easily under the skin. Fibroadenomas are most common in women in their 20s and 30s, though they can happen at any age.

They are usually painless, though some feel tender just before a period. They can grow during pregnancy and breastfeeding and often shrink again afterwards, which makes sense because they respond to the same hormones that change your breasts across pregnancy and your cycle.

Most fibroadenomas need no treatment at all, and for most people having one does not raise the risk of breast cancer. Breast Cancer Now notes that complex fibroadenomas carry a very slightly increased risk. A fibroadenoma may be removed if it is large, keeps growing, or is uncomfortable, and that is a conversation to have with your surgeon.

What is a breast cyst?

A breast cyst is a small sac filled with fluid. According to Breast Cancer Now, cysts are most common in women over 35, especially between 35 and 50 while periods are still happening, and in women taking HRT. They are uncommon after menopause.

A cyst often feels like a smooth, round or oval lump. It can appear quickly, sometimes over days, and may feel sore before a period and ease afterwards. Some women have more than one, in one or both breasts.

An ultrasound can usually show whether a lump is filled with fluid or solid. If the cyst can be felt easily, a doctor may draw the fluid off with a fine needle, which both confirms what it is and often makes it disappear. Most cysts go away on their own, and having cysts does not increase your risk of breast cancer. They can come back, so if you have had one before, still get a new lump checked rather than assuming it is the same thing.

Why do my breasts hurt before my period?

Breast pain that comes and goes with your cycle is called cyclical breast pain, and it is driven by the hormone changes of your menstrual cycle. The NHS describes it as pain that begins up to two weeks before a period, gets worse, and then goes away when the period ends. It usually affects both breasts and feels dull, heavy or aching, sometimes spreading into the armpit.

Those two weeks are the luteal phase, the second half of your cycle after ovulation, when progesterone rises alongside oestrogen. Many women also notice their breasts feel fuller or lumpier at this time. If this phase tends to hit you hard in other ways too, we write about it in the luteal phase crash before your period, and our guide to understanding your cycle walks through each phase.

Breast Cancer Now notes that breast pain on its own is rarely a sign of breast cancer. There is also non-cyclical breast pain, which does not follow your period and has other causes, from muscle strain to some medicines. It often settles with time, but it is worth a check if it is new or stays in one spot.

What helps cyclical breast pain?

A few simple steps can help, based on NHS and Breast Cancer Now advice:

• Wear a well-fitted, supportive bra during the day, and a soft one at night.
• Take paracetamol or ibuprofen, or try a painkilling gel, if you can safely use them.
• Keep a note of when the pain starts and stops. Your GP may ask you to fill in a simple pain chart to see whether it is linked to your periods.

That third step is more useful than it sounds. When you can say "it starts around day 16 and stops when my period comes," a doctor can recognise cyclical pain much faster. A tracking pattern also makes it easier to notice if something stops following the usual rhythm.

Which changes still need to be checked?

Reassurance is not the same as ignoring things. See a doctor or nurse if you notice:

• any new lump in your breast or armpit, even if you feel sure it is a cyst
• a lump that does not go away after your next period
• a lump that feels hard, fixed in place, or is getting bigger
• dimpling or puckering of the skin, or skin that looks like orange peel
• a change in skin colour, which on Black or brown skin may look darker than usual rather than red
• a nipple turning inwards, a rash on the nipple, or bloodstained discharge
• a change in the size or shape of one breast
• breast pain that is new, stays in one spot, or is not improving

The NHS says to get urgent help if your breast is red, hot and swollen, or you have breast pain with a very high temperature, which can be signs of infection. And if you have a family history of breast cancer, mention it whenever you raise a breast symptom.

Checking your breasts at the same point in your cycle, such as a few days after your period ends, makes it easier to spot what is new. Our breast self-exam guide shows you how.

What happens when you go in?

In the UK, a GP will examine you and may refer you to a breast clinic. There, you may have a breast examination, a scan, and sometimes a biopsy, where a thin needle takes a small sample of cells. Women under 40 are usually offered an ultrasound first, because younger breast tissue is denser and harder to read on a mammogram. Ultrasound uses sound waves, so there is no radiation involved.

In Nigeria, Kenya, Ghana or South Africa, the path may run through a general hospital, a gynaecologist or a private imaging centre. If you are not sure where to start, our breast screening guide for Nigeria, Kenya and the UK explains the tests and where to find them.

Be persistent if you need to be. Being told "you are too young" is not an examination, and younger Black and African women do get breast cancer, sometimes the aggressive kinds. We explain why in breast cancer in young Black and African women.

This post is education, not medical advice. A new lump always deserves a professional look, even when the most likely answer is a harmless one.

Asele can make that conversation easier. Cycle tracking and symptom logging let you record when breast pain or a lump appears and whether it changes across your cycle. Amara can help you think through what to ask in Yoruba, Hausa, Igbo, Swahili, French or English, and the Asele Health Brief pulls your notes into a summary to bring to your appointment. You can find us at Asele. Most lumps are nothing to fear, and getting yours checked is how you find that out for sure.

References

1. NHS. Breast lump. nhs.uk
2. NHS. Breast pain. nhs.uk
3. Breast Cancer Now. Fibroadenoma. breastcancernow.org
4. Breast Cancer Now. Breast cysts. breastcancernow.org
5. Breast Cancer Now. Breast pain. breastcancernow.org
6. Cancer Research UK. Breast ultrasound. cancerresearchuk.org