Congenital adrenal hyperplasia is a group of genetic conditions characterized by abnormal production of several hormones produced by the adrenal glands, including those responsible for sexual characteristics. It can affect the development of both primary and secondary sexual characteristics. It can affect people of either sex. Symptoms first develop in the fetus during the second month of pregnancy and are usually apparent at birth. However, all infants are now routinely screened for one form of the condition which can be treated with hormones as long as they are administered early enough.