The Back Pain She Thought Was Her Mattress Turned Out to Be a Sign of Advanced Breast Cancer

Sometimes symptoms that seem ordinary can have a much more serious explanation. For Kimberley Anderson, persistent aches in her back and shoulders initially seemed like the result of an uncomfortable mattress. She never expected those seemingly routine problems to eventually lead to a diagnosis of stage four breast cancer that had spread to her brain.

Kimberley, 39, from Dundee, Scotland, had already experienced breast cancer once. She was diagnosed with stage three breast cancer in 2019 after discovering a lump in her left breast. Following treatment, she was told in early 2021 that there was no evidence of cancer.

For a time, she was able to put the experience behind her.

By 2023, however, Kimberley began experiencing symptoms that were difficult to explain. She developed persistent muscle aches, particularly around her back and shoulders. She also experienced significant tiredness, nausea, weight loss and a reduced appetite.

Because she was otherwise trying to maintain a healthy lifestyle and regularly went to the gym, she did not immediately associate the symptoms with cancer.

Instead, she suspected her mattress might be responsible.

She eventually bought a new mattress, hoping it would solve the problem. But the symptoms continued.

When the symptoms became impossible to ignore

The situation became increasingly concerning when Kimberley developed severe pain in her neck. Eventually, the discomfort became so intense that breathing and swallowing were difficult.

She went to A&E, where doctors arranged further investigations.

A CT scan in August 2023 revealed a tumour measuring around 5cm in her neck. Further testing confirmed that her previous breast cancer had returned.

This time, the diagnosis was stage four breast cancer.

At this stage, the disease had spread beyond the original breast and affected several other areas of her body, including the chest wall, ovary, rib and adrenal gland.

For Kimberley, the diagnosis came as a devastating shock. Having previously been told that her treatment had been successful, she believed cancer was a chapter of her life that had ended.

She began treatment that included radiotherapy and chemotherapy.

But another major setback followed.

Cancer later spread to her brain

In July 2024, Kimberley was told that the cancer had spread to her brain.

She subsequently underwent surgery in September 2024 to remove a brain tumour. She has continued treatment with daily oral chemotherapy tablets.

Despite the seriousness of her diagnosis, Kimberley says her cancer is currently stable. According to the account she shared, scans have shown no growth for more than a year.

Her experience has also changed the way she views symptoms and health checks.

She now wants other women to pay attention to changes in their bodies, including people who may think they are too young to be concerned about breast cancer.

Breast cancer does not always look the same

A breast lump is one of the symptoms people are most familiar with, but changes can appear in other ways.

Possible warning signs can include a new lump or swelling in the breast, chest or armpit, changes to the skin, alterations in breast size or shape, nipple inversion, unusual discharge, or a rash or crusting around the nipple.

Persistent pain can also deserve medical attention, particularly when it is unusual for you or does not go away.

However, many of these symptoms can have causes unrelated to cancer. Having one of them does not automatically mean someone has breast cancer.

The important point is to understand what is normal for your own body and speak with a healthcare professional when something changes or persists.

Previous cancer can make new symptoms particularly important

Kimberley's story also highlights why people who have previously had cancer should remain aware of their health after treatment.

Being told that there is no current evidence of cancer does not necessarily mean someone can never develop another cancer or experience a recurrence. Follow-up appointments and monitoring are therefore important.

People who have completed treatment should follow the advice provided by their cancer team and report new or unexplained symptoms.

Back or shoulder pain is extremely common and is often caused by muscles, joints, posture, injuries or other non-cancerous conditions. It would be misleading to suggest that ordinary back pain is usually an indication of cancer.

What makes Kimberley's experience notable is the combination of persistent symptoms and her previous history of breast cancer.

Screening remains an important part of breast health

Breast screening can detect some cancers before symptoms appear. In the UK, routine NHS breast screening is generally offered to eligible women between the ages of 50 and 71, with invitations normally sent every three years.

Screening is not a guarantee that every cancer will be detected, and people should still report concerning changes between appointments.

Anyone who notices a new breast lump, unexplained change in the breast or nipple, persistent unusual pain, or another concerning symptom should seek medical advice rather than waiting for a routine screening appointment.

It is also important not to assume that breast cancer only affects older women. Although the risk generally increases with age, younger people can also develop the disease.

Kimberley's message: know your body

Perhaps the most powerful part of Kimberley's story is her determination not to be defined by statistics.

Although she has been given information about prognosis, she has said that she does not regard herself as a number. Her focus remains on continuing treatment and hoping it works for as long as possible.

She is also encouraging women to become familiar with their breasts and to seek medical attention when something feels different.

Her experience is a reminder that health concerns should not simply be dismissed because there appears to be an obvious explanation.

An uncomfortable mattress may genuinely cause back pain. Exercise can lead to muscle soreness. Tiredness can have countless explanations.

But when a symptom persists, worsens, appears alongside other unexplained changes, or feels different from what you normally experience, it is reasonable to get it checked.

Ultimately, Kimberley's story is not a message that every ache is cancer. It is a reminder to listen to your body, attend recommended screening appointments and seek professional advice when something does not feel right.

Early investigation can help doctors identify the cause of symptoms and, when cancer is involved, may provide an opportunity for earlier diagnosis and treatment.

Source

The Sun Health on 25 August 2026, featuring Kimberley Anderson's account and information about breast cancer symptoms and screening.

Disclaimer

This article is for general informational purposes only and is not medical advice. Back, shoulder or neck pain can have many different causes and does not necessarily indicate cancer. If you have persistent, worsening or unexplained symptoms, or notice changes in your breasts, speak with a qualified healthcare professional. Do not delay medical care because of information read online.