Uyioyoi

What hormonal problem could be causing these symptoms?

There could be a benign tumor of the pituitary gland.

Why would joint damage be associated with rapid growth and low testosterone levels?

Growing too quickly for the joints to mature properly as well as the low testosterone causing brittle and easily broken joints.

Should Dr. Kidd tell Eric that he is probably sterile? Why would he be sterile?

Yes, he should tell the patient that he may be sterile, so the patient can prepare if he is unable to play his part in conceiving a child. Better to be aware of the problem and have it not be a problem then to be clueless as to why there is a problem. He would be sterile because of the pituitary tumor that grew causing the gland to not allow the testes to start developing testosterone and sperm.

Is there anything that they could try to do to stimulate spermatogenesis? Why is the absence of facial hair important?

They could try artificial hormones to try and stimulate sperm creation, but there is no indication that it would work. The absence of facial hair is important because it signifies that there is no release of the hormones that cause facial and body hair growth.

Why was he growing facial hair? Hint: HCG acts like FSH and LH, which are pituitary hormones that trigger a variety of sexual developments and secondary sexual characteristics, whereas testosterone is more of an end-level hormone.

He was growing facial hair because for two years he had been using HCG, which causes body hair growth as well as some sperm stimulating properties, which had not worked. Essentially, the HCG had put him through puberty.

Why did he need jaw surgery?

The bones in his jaw were growing incorrectly and had to be broken and reset in order for Eric to continue leading a somewhat normal life with the ability to eat and speak. They were expanding his upper jaw to stay uniform with his lower jaw.

Why are his kidneys so active at night? Note: diabetes insipidus...