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If you receive a concussion, which is a type of head injury, during a game of sport, new official guidance says you mustn't play again for at least 24 hours.

"If in doubt, sit it out" - that's the message the government and the Sport and Recreation Alliance want to get across to people playing football, rugby, or anything else where you might hurt your head.

It's the first UK-wide concussion guidance for people playing grassroot sports, which means clubs that aren't professional.

It follows many reports and investigations into the dangers of blows to the head in sport for people of all ages, and how best to keep players safe.

A concussion is a brain injury.

It happens if you hit your head very hard, or very suddenly. It can also occur if other parts of your body are hit which causes your head to move suddenly, which is sometimes known as whiplash.

It can can change the way someone thinks, feels and remembers things.

While all head injuries are serious, effects of a concussion are usually temporary and most people recover fully with rest.

The highest number of concussions were in:

The "If in doubt, sit it out" strapline is being used to encourage anyone who hits their head to immediately sit out of a game, to make sure their injury doesn't get worse.

They shouldn't return to PE lessons or their sports club for at least a whole day if they suffer a potential concussion, and NHS 111 should be called.

The guidance comes after Scotland published concussion advice in 2020, which made it the first country in the world to do it for all levels of sport.

The group that drafted the guidelines was chaired by Professor James Calder, a surgeon who has operated on football stars such as Gareth Bale and Neymar.

"We know that exercise is good for both mental and physical health, so we don't want to put people off sport," he said.

"But we need to recognise that if you've got a head injury, it must be managed and you need to be protected, so that it doesn't get worse."

In that time, they also shouldn't ride a bike, drive or be left alone, the guidance says.

They should minimise smartphone and computer use for at least 48 hours, as staring at a screen can make it take longer to recover.

And they shouldn't return to competitions for at least 21 days, or three weeks.

However, if the concussion results in the person losing consciousness or "blacking out" (which only happens in 10% of cases), the person should immediately be assessed by a medic if there's one nearby, or taken to the Accident and Emergency department at hospital.

The government say that returning to education or work takes priority over returning to sport.

At amateur clubs and games, it's not always the case that there will be a medical team nearby to treat someone who suffers a head injury.

Grassroots clubs are also often (but not always) made up of young people.

And while the NHS does not collect data on the number of concussions in grassroots sport, data from the Rugby Football Union (RFU) suggests a team of 15- to 18-year-olds will have a player concussed once in every 10 games on average.

Researchers at Newcastle University analysed A&E records and found under-19s accounted for almost half of of people there with a sports injury.