Kallmann syndrome is a known as a secondary hypogonadism condition.
This means the problem is with not with the testicles / ovaries themseleves but with the production of the hormones that should have been released at puberty.
One key hormone called GnRH.
GnRH is not released correctly at the time puberty is due.
In turn this prevents the pituitary gland from releasing two hormones called FSH and LH, collectively called gonadotropins.
Without these gonadotropins the ovaries and testicles remain dormant, puberty does not start or fully complete and no reproductive cycle is possible.
