Most people associate hair loss with age, but invisible hair thinning can begin as early as your 20s. This early-stage thinning often goes unnoticed because the hair density decreases gradually — without major shedding. Common causes include stress, nutritional deficiencies, hormonal imbalances, and excessive styling or heat exposure. Over time, these factors damage the hair follicles, leading to weaker strands and slower regrowth. Understanding these early signs can help you act before visible loss occurs. Maintaining a balanced diet, using scalp-friendly products, and supporting hair with essential nutrients like biotin and zinc can make a big difference in long-term hair health.