See a dermatologist to identify the cause of hair thinning
Treat underlying conditions such as iron deficiency, thyroid disorders, hormonal imbalance, or scalp disease
Eat enough protein, iron, zinc, vitamin D, and B vitamins
Avoid crash diets and rapid weight loss
Use gentle shampoo and avoid harsh chemicals
Limit heat styling, bleaching, and frequent coloring
Avoid tight hairstyles that pull on the scalp
Reduce stress with regular sleep, exercise, and relaxation
Stop smoking
Review medications with a doctor if hair thinning started after a new drug
Consider topical minoxidil if appropriate
Use prescription treatments if recommended by a doctor
Treat dandruff or scalp inflammation promptly
Handle hair gently when wet
Avoid excessive brushing or tugging
Track shedding and changes over time
Seek medical care promptly if thinning is sudden, patchy, or severe