I don't think it's anything in his diet as he eats plenty of fruit, plenty of fibre and water each day.
It breaks my heart when he is screaming trying to go. The first time he got it I got a medication from the chemist although haven't given it to him since as I don't want his body relying on it.
The chemist said it could be teething ??!? Which could be as he does have 2 teeth growing.
Any suggestions / help / tips / experiences on the topic?