How can I mark any desired item/statement in red circle/ oval mark as shown in this slide. Can it be animated too?

How can I mark any desired item/statement in red circle/ oval mark as shown in this slide. Can it be animated too?

One simple possibility is to use the tcolorbox package:
\documentclass{beamer}
\usetheme{CambridgeUS}
\useoutertheme{sidebar}
\usepackage[most]{tcolorbox}
\tcbset{
mytext/.style={
top=0pt,bottom=0pt,left=0pt,right=0pt,colback=gray!10,colframe=structure}
}
\newcommand<>\HLtext[2][]{%
\hspace*{-4pt}\tcbhighmath[mytext,#1]{\text{#2}}}
\begin{document}
\begin{frame}
\frametitle{Consensus to define FD symptoms}
\begin{itemize}[<+->]
\item Epigastric discomfort or pain.
\item \HLtext{Postprandial heaviness.}
\item Early satiety.
\end{itemize}
\end{frame}
\end{document}

\HLtext is overlay aware.
beamer lingo.)
– Sean Allred
Aug 09 '13 at 13:39
\Hltext<3->{text}.
– Gonzalo Medina
Aug 09 '13 at 13:49