Physical Damage: 

• Over-brushing or combing

• Tight hairstyles (e.g., braids, ponytails)

• Heat styling (e.g., blow dryers, flat irons)

Nutritional Deficiencies: Iron deficiency and Vitamin D deficiency. 

Hormonal Changes: pregnancy and menopause. 

Medical Conditions: thyroid disorders and autoimmune diseases. 

Other Factors: stress, age, and genetics.