A ten year old boy has high levels of the growth hormone. He is likely to develop:

The boy is likely to develop gigantism. This condition is characterized by excessive growth and height significantly above average. Here are the steps that lead to this conclusion:

1. Growth hormone is produced by the pituitary gland. It's crucial for growth in children and adolescents. It helps regulate body composition, body fluids, muscle and bone growth, sugar and fat metabolism, and possibly heart function.

2. High levels of growth hormone over a long period in a child who is still growing will cause their bones and body parts to continue to grow and enlarge. This is a condition known as gigantism.

3. Gigantism is usually caused by a tumor on the pituitary gland of the brain. It causes excessive growth in height, but the height of the person will depend on the age of the child when the condition starts, and on whether the growth plates in the bones have closed.

4. Other symptoms of gigantism can include delayed puberty, irregular periods, increased sweating, joint pain, and thick, oily skin.

5. It's important to note that while high levels of growth hormone can lead to gigantism, it's a very rare condition. Most cases of excessive height are not due to an overproduction of growth hormone.