A woman from England is warning others about a dangerous diagnosis after her knee bones fractured while sitting on the toilet.

Bethany Eason, 26, started experiencing some knee pain when she was 19 years old and visited a doctor who gave her an X-ray and referred her to a physical therapist.

She claimed the doctor told her that there was “something there” after getting the X-ray but wasn’t sure what it was, South West News Service reported.

But one day, in February 2017, she was especially in agony walking up the stairs to get to her bedroom.

She had come home from college one day and, noticing her knee was sore, stopped in the bathroom to take a rest on the toilet seat, and when she did, her knee bones fractured — as a result of a giant cell tumor in her knee.

“It just shattered,” Eason told SWNS of her “one-in-a-million” happening.

“I felt this immense pain and it was almost like a pop — it was really traumatic.”

The tumor had weakened the bones in her knee as well as the soft tissue surrounding it.

Eason’s partner called an ambulance, and she was rushed off to the hospital, where she later learned that she would have to undergo both a knee and thigh bone replacement as a result of the tumor.

A giant cell tumor is a kind of rare and aggressive non-cancerous tumor, according to Johns Hopkins Medicine, and it usually grows “near a joint at the end of the bone.”

Not only can it grow in the knee, but it can also appear in the bones in your arms and legs, as well as the pelvis.

“I was heartbroken — I used to dance, run and swim and thought I would never be able to do those things again,” Eason told SWNS of the surgery.

“At that moment in time, you don’t see a way out — I was told when I had surgery that 99% of patients wouldn’t have full mobility after surgery.”

Doctors told her that she would have to re-learn how to walk and that she may never wear heels again.

But Eason defied the odds and was able to regain full mobility.

“I said, ‘Well, 1% can and I can be that 1% and prove you wrong,’ and I did,” Eason said.

She spent seven weeks in intense physical therapy and worked on strengthening her new leg for a year through home exercises — and even ended up back in a pair of heels.

“I didn’t know what my life was going to look like. Now I can do all those things they thought I wouldn’t be able to — I can kneel and run after my little boy,” Eason explained.

Eason is urging others to go to the doctor if they are feeling like something isn’t right in their body — as simple knee pain could turn into something quite serious.

Some of the symptoms of a giant cell tumor include swelling, a visible mass, limited movement in the joint that’s nearest to the tumor and a bone fracture, like the one that Eason experienced, according to Johns Hopkins Medicine.

“It’s really important to raise awareness of rare tumors; you wouldn’t think a pain in your knee would be something like that,” Eason said.

The 26-year-old now goes for scans and check-ups every year to make sure that everything is all right.

Eason also gave a shout-out to the nurses who took care of her at the Robert Jones and Agnes Hunt Orthopaedic Hospital in Gobowen, England.

She even nominated her nurse, Pip Page-Davies, for the NHS Trust’s Patient Choice Award last year — which she won.

“The whole team were fantastic, and this one nurse was fantastic — she held my hand and was always there; she was the first person to show me my scar,” Eason said.

“It was little moments which were the light during a dark time — they made sure I was as cared for as possible even though it was such an awful time in my life.”