A wider part line than usual
More scalp showing through your hair
A receding hairline
A ponytail that feels thinner or smaller
More hair shedding on pillows, in the shower, or on brushes
Hair that looks less dense overall
Shorter, finer, or weaker strands
Patchy areas of reduced hair volume
Increased visibility of the scalp under bright light
A noticeable change in hair thickness over time