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There are many theories about what actually causes dandruff and a variety of treatments to control it. Dandruff can happen at any age (called cradle cap in newborns and infants) but is most commonly found in people above the age of 12. Suggested internal causes include hormonal imbalance, excessive perspiration, excessive consumption of sugar, fat, or starch, emotional stress, lack of rest, heredity pre-disposition, poor hygiene, allergy (dairy products, chocolate, nuts and shellfish), and poor nutrition. Possible external causes include infrequent shampooing of the hair or inadequate rinsing, cold weather and dry indoor heating, improper use of hair-coloring products, hairsprays and gels or excessive use of electric hair curlers, and infection with a fungus called Pityrosporum ovale.
Unfortunately, for some people, it can increase in numbers, leading to dandruff. Dandruff can be seasonal. Dandruff is often known as "dry scalp", but people with oily scalps tend to suffer the most. A key point to remember is to select the mildest shampoo possible.
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