Acute kidney injury, which NHS guidance says is 'needlessly' killing thousands of patients, is a problem that affect patients who are already seriously ill in hospital.
Fiona Loud of the Kidney Alliance said patients with systemic illnesses were most at risk.
ITV News Science and Medical Editor Lawrence McGinty explains:
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Leading doctor Dr Otmar Kloiber said studies show boxing produces 'serious harm' including ruptures in the brain.
Cloudy skies and steady rain moving eastwards and northwards across England and Wales today.