Which statement about systemic hair changes is true?

• A. They Are Caused Only by External Chemical Exposure
• B. They Affect Only Hair on the Scalp
• C. They Are Unaffected by Hormones
• D. They Can Be Influenced by Hormonal Changes and Underlying Medical Conditions

Answer: (D)

Systemic hair changes come from factors that affect the whole body, not just a single spot on the head. Hormones and overall health conditions are major drivers of these changes because they influence the hair growth cycle across the entire body. When hormonal balance shifts—such as during thyroid disorders, pregnancy, menopause, or changes in androgens—it can cause diffuse shedding or thinning that isn’t limited to the scalp. Similarly, underlying medical issues or nutritional deficiencies (like iron, zinc, or protein shortages, autoimmune diseases, or chronic illnesses) disrupt how hair grows and rests, leading noticeable changes in hair density and quality all over.

That’s why the statement highlighting that systemic hair changes can be influenced by hormonal changes and underlying medical conditions is the best answer. The other options don’t fit because systemic changes aren’t caused only by external chemical exposure, don’t affect only scalp hair, and are indeed influenced by hormones.