The Pituitary Foundation charity estimates 25 to 30 per cent of people with serious head injuries sustain pituitary damage. The pituitary is known as the ‘master gland’ as it controls the thyroid and adrenal glands that are responsible for metabolism, stress and growth hormones and the male sex hormone testosterone. When the pituitary gland is damaged, a range of disturbing symptoms arise including impotence, depression, low libido, infertility and fatigue. Even people with minor head injuries who don’t even lose consciousness can sustain damage to their pituitary gland. Encouragingly, early detection and hormone therapy can significantly ease the symptoms. But worryingly, not enough people are tested for this damage at an early stage. There are calls for this to be addressed by the Pituitary Foundation and Headway.