Loss of hair is a very common complaint and can be permanent or reversible. Remember that some of your hairs are always temporarily in a resting stage and before entering this resting stage the hairs naturally shed daily. What is too much daily loss? Generally less than 100 hairs on a non-shampoo day. Hair loss is caused by hereditary, hormonal/metabolic changes and diseases of the hair follicle or shaft. A detailed history and examination is required in many cases to get to the root of the problem. Hair is easiest to restore at the earliest onset of loss.
These are examples of male parttern baldness: