Offering regular colonoscopies to people with Lynch syndrome at any age will save lives, NHS England says.
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The vote in favour of a strike could see junior doctors take part in a 24-hour walkout in March.
Experts are particularly worried about the proportion of younger people whose health is at risk.
Patients are facing delays for ongoing cancer care, heart check-ups and eye treatment in England.
Hannah Huxford from Grimsby is unable to get hold of her ADHD medicine due to a national shortage.
Karen Cook has a rare condition called pain hyperacusis which causes crippling and debilitating pain.
Overseas dentists may be provisionally registered to work in England without checks, plans say.
Some patients, especially newborns, need specially tested blood to ensure it does not cause harm.
The treatment will mean many people no longer needing to take more than 20 pills across the day.
Without a clinical trial, Louis O'Brien-Smith fears he will "keep deteriorating and probably die".