Ans. Contrary to the old believe, studies over dandruff indicate that dandruff is not caused by too much use of shampoo or dry skin. Most common result of the cause of dandruff is found to get triggered by overactive oil glands, poor metabolism, excessive perspiration and many other factors. Among the before mentioned probabilities, more often than not, it is the result of a poor metabolic process.
The scalp has general process of constantly renewing and shedding itself due to a fungus called malassezia present in every bodys scalp. Thus the Old cells die out to make way for the new ones. So, dandruff is a normal phenomenon for every body. But dandruff symptoms gets aggravated when the scalp comes in contact of harse chemical effect of some hard shampoo, excessive exposure to dust, UV light, improper metabolic function of body. Actually these factors cause manifold increase in these fungus, they in turn causes formation of the new cells much faster than the rate of shedding off old cells. This excessive formation of new cells cause accumulation of unhealthy residue on the scalp in the form of flakes.
Too much oiliness of the skin rather than dryness also cause dandruff..Seasonal changes, emotional stress, certian diseases etc triggers a flare up. Other factors include family history, excessive sweating, using alkaline soaps, yeast infections and food allergies.

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