Can Hair Become Thick Again?

Whilst thinning hair caused by Male Pattern Baldness will not 'get thicker' again of its own accord, where Telogen Effluvium is the only issue, normal hair growth can resume without intervention so the hair should return to its previous density within approximately six months.

How can I make my hair thick again?

Can existing hair become thicker?

The thickness of a hair strand is ultimately determined by the diameter of the follicle. Once the hair has protruded from the follicle, the hair cannot grow or expand to become any thicker. It's biologically impossible to do so because once the hair is out of the follicle, it's a wrap – the hair is dead.