I am putting together a site for a portal. Some of the subdomains have rather long names and I am thinking that maybe I should use hyphens to make the subdomain names more readable.
alternative-medicine.mysite.com instead of
However, I can't recall ever seeing a hyphenated subdomain - is this because it is generally frowned upon? Or are there technical (SEO) reasons why this appears to be the case?
In short, will hyphenating my subdomains have a negative impact on SEO?