In the new treatment, specialists use a high dose of chemotherapy to knock out the immune system before rebuilding it with stem cells taken from the patients own blood.

Stem cells are so effective because they can become any cell in the body based on their environment.

"Since we started treating patients three years ago, some of the results we have seen have been miraculous," Professor Basil Sharrack, a consultant neurologist at Sheffield Teaching Hospitals NHS Foundation Trust, told The Sunday Times.

"This is not a word I would use lightly, but we have seen profound neurological improvements."

During the treatment, the patient's stem cells are harvested and stored. Then doctors use aggressive drugs which are usually given to cancer patients to completely destroy the immune system.

The harvested stem cells are then infused back into the body where they start to grow new red and white blood cells within just two weeks.

Within a month the immune system is back up and running fully and that is when patients begin to notice that they are recovering.

Holly Drewry, 25, of Sheffield, was wheelchair bound after the birth of her daughter Isla, now two.

But she claims the new treatment has transformed her life.

It worked wonders, she said. I remember being in the hospital... after three weeks, I called my mum and said: 'I can stand'. We were all crying.

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'Miracle' stem cell therapy reverses multiple sclerosis