A mother has described how her teenage son woke from a coma addicted to cheese and compulsively swearing . Kai Thomas , 15 , suffered a sudden , potentially life-threatening brain bleed in June last year . He had surgery to relieve pressure on his brain and doctors at Sheffield Children 's Hospital put him in a coma for nine days so he could recover . When he woke up he was unable to move or speak , a result of the trauma his brain had endured . While he has since regained the ability to walk and talk again , Kai has been left with some unusual side-effects . He has become so addicted to cheese that he munches on several blocks of it a day - and even puts it on his cereal . And previously well-mannered , he now regularly swears , to his mother 's horror . Kai Thomas , 15 , suffered a sudden , potentially life-threatening brain bleed in June last year . Since then , he has become 'addicted ' to cheese and swears profusely . His mother Tracey , of Chesterfield , said : 'He 's addicted to cheese – and he ca n't stop swearing . ' The 35-year-old explained that before falling ill , Kai was a good-natured , well-manned young man . 'He did n't swear and minded his manners , ' she said . 'Then in June last year , he came home from school rubbing his head and saying it hurt . Then he suddenly collapsed . ' Mrs Thomas called 999 and Kai was taken to Sheffield Children 's Hospital . 'Doctors carried out scans and the results showed a bleed on the brain , ' she said . 'They told me it could have just come out the blue or he could have knocked himself . ' Kai spent six hours in theatre where surgeons battled to save his life . Thankfully , doctors were able to stabilise his condition - and they put him in a coma to give his body a chance to recover . Nine days later he woke up . 'His face was blank and he could n't speak , ' said Mrs Thomas . 'Doctors said the trauma of the bleed and subsequent surgery had caused him to regress . He 'd also lost his power of speech and movement . ' To her relief , his condition gradually began to improve - and a few weeks later he started speaking again . Last September , he finally got to go home - but there was more drama to come . Mrs Thomas said : 'One day I was in the kitchen , when I heard Kai yelling in his bedroom . 'He was screaming `` F*** , b****** , s*** '' . ' I wondered what on earth was going on - the expletives were coming thick and fast . ' Kai 's mother , Tracey , said while he always liked cheese , her son has now become 'obsessed ' with it - even putting it on his cereal . His mild-mannered temperament has also been replaced with aggression . Experts say every patient reacts differently . 'No two cases are the same and there can be physical , cognitive , emotional and behavioural problems as a result of a head injury , ' said a brain charity spokesman . Upon going upstairs to see what was happening , she found Kai munching on an entire block of cheese . Then , over the next few weeks , she noticed all types of cheese going missing from the fridge . 'He had always like cheese but now he was obsessed with it - he even added it to his cereal , ' said Mrs Thomas . 'We asked the doctor about it and apparently it 's quite normal for people to develop inappropriate or aggressive behaviour after waking up from a coma . So while that explained the swearing , no one can explain the cheese . ' Kai 's condition is gradually improving and he now undergoes home tutoring as well as attending mainstream school for an hour each day . A spokesman from Headway , the brain injury charity , said : 'There can be physical , cognitive , emotional and behavioural problems as a result of a head injury . No two cases are the same . '
Kai Thomas , 15 , suffered a sudden , potentially life-threatening brain bleed . Doctors battled to save his life and put him in a coma to recover . When he woke up , he was 'addicted ' to cheese and swore frequently . Experts : 'Can be various effects of head injury - no two cases are the same '