Some diseases associated with hair loss are hypothyroidism, iron deficiency, seborrheic dermatitis and secondary syphilis.Once these diseases are treated, hair grows back to its normal style.

• 会引起脱发症状的疾病通常有：甲状腺机能减退、缺铁、脂谥性皮炎和二期梅毒疹，这种由疾病引起的脱发也会在这些疾病被治愈后消失，到时你的头发就会回到正常的生长状态。