Leading Cause of Heavy Dandruff The most common cause of a lot of dandruff is an overgrowth of a natural scalp yeast called Malassezia. When it grows too much, it irritates the scalp, speeds up skin cell turnover, and causes large, visible flakes. Other major triggers include: Oily scalp (feeds the yeast) Stress (weakens scalp balance) Cold, dry weather Poor shampoo habits Skin conditions like seborrheic dermatitis Heavy dandruff isn’t dirt — it’s usually a scalp imbalance. #viralreels #fblifest