Pain in the heel of kids is not very common, however when it does occur, the most common cause is a disorder called Severs disease. It is not really a “disease”, but it's the term which has unfortunately stuck. It is properly named calcaneal apophysitis. It is a problem in the growing region at the back of the heel bone. As it is a disorder, of the growing bone, the disorder is self-limiting and will not be a problem once the growth of that bone has finished. It is more prevalent around the ages of 10-12 years.
The typical sign of Severs disease are soreness on exercise and soreness on compressing the sides of the rear area of the heel bone. To begin with the discomfort is not that bad and doesn't affect activity much, but later it becomes more severe and impacts athletic levels and might result in limping. The actual cause of it is not known, but it is clearly an too much use type condition because it is more common in kids who participate in more sport and more prevalent in children who have a higher bodyweight. Children with tighter leg muscles can also be at a higher possibility for the chances of this problem.
Usually, the management of Severs disease is load management. The child is urged to remain active, but just scale back exercise amounts to a level which can be coped with and not too uncomfortable. A cushioning heel raise in the footwear may be useful to cushion it. Ice right after exercise might also be useful to help the inflammation. If the leg muscles are tight, then a stretches ought to be started. At times foot supports can be helpful if the arch of the foot is overpronated. On rare occasions a splint may be used, and all sport ceased until it gets better. By the mid-teens the growth plate that this occurs at combines with the rest of the heel bone, so this ceases to be an issue at those ages.