To replicate the issue you're reporting, it turns out to be necessary to load the enumitem package in addition to the hyperref (or nameref) package. E.g., the following MWE
\documentclass{article}
\usepackage{enumitem}
\usepackage[colorlinks]{hyperref} % or: \usepackage{nameref}
\begin{document}
\begin{description}
\item[Category\label{desc:category}] blablabla
\item[Profile\label{desc:profile}] blabla
(\nameref{desc:category}) blabla
\end{description}
\end{document}
produces this output:

In short, it looks like you've come across a rather significant and quite unfortunate conflict between the enumitem and hyperref packages. (Christian Hupfer's answer, which was posted a couple of minutes earlier than mine, provides a more in-depth diagnosis of the nature of the conflict conflict.) Interestingly, the three answers to the query Reference name of description list item in LaTeX do not appear to fix the spacing issue.
Instead of using the enumitem package, you might consider using the enumerate package. It doesn't offer quite as many bells and whistles as the enumitem package does. However, depending on your formatting needs (about which you've revealed exactly zero so far...), the enumerate package may offer all the functionality you really need.
If, however, you simply must use the enumitem package, I suggest you not employ the basic-LaTeX \label-\ref mechanism inside description environments. Instead, use the more general \hypertarget-\hyperlink mechanism of the hyperref package.

\documentclass{article}
\usepackage{enumerate}
\usepackage[colorlinks]{hyperref}
\begin{document}
\begin{description}
\item[\hypertarget{desc:category}{Category}] blablabla
\item[\hypertarget{desc:profile}{Profile}] blabla
(\hyperlink{desc:category}{Category}) blabla
\end{description}
\end{document}
hyperrefand/ornamerefpackages. – Mico Apr 19 '17 at 16:53\labelor of\namerefintroduces spurious spaces because the lines of the definition are not properly terminated with%. But we can only tell for sure if you provide a complete small document showing everything from\documentclassto\end{document}. – gernot Apr 19 '17 at 16:54descriptionlist item in LaTeX – Werner Apr 19 '17 at 16:55