Boy faces heart attack if he laughs
It's certainly no laughing matter for a seven-year-old with a serious heart condition.
Bradley Burhouse was diagnosed with a rare cardiac condition that means that if he laughs his heart can race at up to 200 beats per minute, the Daily Mail reported.
Every chuckle runs the risk of the young boy having a heart attack, and Bradley has also been forced to give up exercising to keep his heart rate down.
The rare condition, called ventricular tachycardia, doesn't even allow him to go outside and play with his brothers Jack and Dalton, and sister Maddison.
Bradley's resting heart-rate can vary between 120 to 200 beats per minute, almost double the average person.
The problem comes from faulty electric signals in the part of the heart chamber known at the ventricles. The ventricles contract faster than normal because of this, overriding the heart's normal rate and rhythm.
This results in the heart pumping blood out more quickly and restricting the amount making it into the ventricles, which can cause dizziness, chest pain and fainting fits.
Bradley was diagnosed with the condition after collapsing in May while playing with his brother.
Bradley's mother, Toni Burhouse, said her son was restricted to the PlayStation and can't run outside.
She said: "Now we have to be so careful that he doesn't get over excited. Even if he's laughing too hard we have to calm him down and make sure he doesn't get too worked up.
"I remember that he used to run up to me and say 'Mum my heart feels like it's going to jump out of my chest.
"I'd always dismiss it and tell him it was only natural because he'd been running around.
"Then one day he was playing with his brother Dalton out in the field next to the house when he fell down.
"Dalton thought he had fallen and smacked his head so he helped him up and they came into the kitchen together.
"By this time Bradley was screaming in pain and then he was violently sick. My husband Simon rushed him to A&E and initially they thought he had a heart murmur.
"It was only when he had further checks that they discovered he had ventricular tachycardia.'
"At the moment he can't do any physical exercise. He has had to sit out on PE lessons and he can't play with his brothers.
"He's been bouncing off the walls, you don't realise how difficult it is to keep a seven year old quiet and calm.
"We've had to buy him a PS3 to try and keep him occupied but it's not ideal.
"Bradley has gone up at least two ages in clothes size since the diagnosis and we are a bit worried about how big he is getting."
