Sepsis is a potentially life-threatening condition that occurs when the body's response to an infection damages its own tissues. When the infection-fighting processes turn on the body, they cause organs to function poorly and abnormally - this can may progress to septic shock.
The difficulty is that Sepsis can be hard to spot. There are lots of possible symptoms, and these can be vague. They can be like symptoms of other conditions, including flu or a chest infection.
One person who knows this better than most is Toby Grimberg. Back in February of 2018, Toby was given a 60 per cent chance of survival after he developed Sepsis.