James has been having leg pains intermittently over the last year. They've tended to be sudden and severe. At times his legs also buckle underneath him. But it's been sporadic and the doctors have struggled to work out what causes it.

The last week he's had more frequent (but not as severe) pains, with cramps and tired legs, and fallen over a few times. He's been limping a lot. It's quite demoralizing for him. We took him back to his brilliant paediatric neurologist today as she wanted to see him when he actually has the symptoms, but unfortunately he didn't seem to be struggling that much when we were there... so she couldn't see anything more than what she's seen before which is inconclusive as to the cause.