is a blood clot that forms within a vein, with deep vein thrombosis being one of the most common forms.
the development of male characteristics (deepening of the voice, facial hair, increase in muscle bulk) in a female or earlier than expected in a male.
a lack of pigment in the skin that causes white patches to appear in several areas including on the hands, face and neck.
a very rare inherited condition that causes presence of multiple tumours arising in several organs across the body including in the brain, spinal cord and eyes.
Vitamin D is a hormone produced by the kidneys that helps to control the concentration of calcium in the blood and is vital for the development of strong bones.