What is a common symptom of a scalp disorder?

Itching or flaking is indeed a common symptom of various scalp disorders. Many conditions, such as dandruff, psoriasis, and eczema, often manifest with these symptoms. Itching indicates irritation or inflammation on the scalp, which can result from a buildup of dead skin cells, an allergic reaction, or other dermatological issues. Flaking is typically a visible manifestation of this irritation, suggesting that the normal shedding process has been disrupted or accelerated due to a scalp disorder.

In contrast, the other symptoms listed do not typically correlate with scalp disorders. For example, hair growth acceleration can indicate a healthy scalp or hormonal changes but is not a direct symptom of an underlying scalp issue. Increased shine of the hair is usually a sign of hair health and proper conditioning, rather than a symptom of a disorder. Similarly, color fading could result from environmental factors or chemical treatments but doesn't specifically reflect a scalp condition. Thus, itching or flaking directly points to the presence of an issue impacting the scalp's health.