  We address some phenomena about the interaction between lower semicontinuous
submeasures on $\mathbb{N}$ and $F_{\sigma}$ ideals. We analyze the pathology
degree of a submeasure and present a method to construct pathological
$F_\sigma$ ideals. We give a partial answers to the question of whether every
nonpathological tall $F_\sigma$ ideal is Kat\v{e}tov above the random ideal or
at least has a Borel selector. Finally, we show a representation of
nonpathological $F_\sigma$ ideals using sequences in Banach spaces.
