What Factors Play a Role in Unhealthy Hair?

The 2011 document identifies environmental, chemical, mechanical, and innate factors as contributors to unhealthy hair. UV light, humidity, chemical treatments like dyes and relaxants, and mechanical damage from styling tools and extensions can harm the hair's cuticle and cortex. Innate factors include hormonal changes, substance abuse, and systemic diseases, which can lead to hair loss, graying, and changes in hair texture. By age 50, approximately 50% of men and women experience hair loss, with male and female pattern hair loss peaking at different decades of life. Anti-androgen therapy may help women with hyperandrogenemia-related hair loss, but most women with pattern hair loss do not have high androgen levels. The document highlights the importance of general health and protective strategies, such as using conditioners and moisturizers, to maintain healthy hair and minimize damage.