There are many causes of hair loss, from stress to iron deficiency. The most common cause of hair loss though is a hormone called DHT, which prevents nutrients from feeding developing hair follicles. The result is a gradual miniaturization of the hairs, until they become so small and colourless that you cannot see them. While there are many other causes of hair loss, including smoking, which reduces blood flow to the hair follicles and a condition called hypothyroidism, which affects the thyroid gland. There are also several myths that have developed that today we are going to dispel.