Can a haircut fix thinning hair?

The answer

No, a haircut cannot treat the cause of thinning, although it can make hair look fuller by changing length and layering. Fine hair often looks better with a blunter edge and slightly more length on top, and very short sides can highlight sparse areas. If you notice new or unexplained thinning, a widening part or increased shedding, see a dermatologist, who can look at possible causes.