2. Lack of puberty
One of the most obvious signs of turner syndrome is the inability for the patient to enter puberty and begin menstruation without the aid of hormone replacement therapy. In hormone replacement therapy — often shortened to HRT — the patient is given the estrogen hormones that her body did not produce enough of on its own so that she will be able to enter puberty. Some women do not undergo this therapy and thus stay in a menstruationless state until adulthood and even seniority.
There have been some studies showing that failure to complete HRT at the appropriate age — before age 20 — might lead to some issues down the line including the premature death of egg cells. That being said, the studies on the long-term effects of turner syndrome if HRT is not received are still limited due to the fact that the sample size of most studies are very small — seeing as most babies with turner syndrome are miscarried rather than born with the syndrome.