Prevent frame Option in includegraphics Making an Overfull hbox

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Here's how you can do; which one to choose between the second and third example is a matter of taste and of what your pictures contain.

The frame option draws a frame with rule of width \fboxrule (by default) and zero space between the frame and the box. But the rule width is added to the width of the box, so you have to do something about it: either reduce a bit the width of the box, or draw the frame inside the box, by specifying a negative separation (second parameter to the frame option).

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\documentclass{article}
\usepackage[export]{adjustbox}
\usepackage{graphicx}
\setlength{\parindent}{0pt} % just for the example

\begin{document}

\footnotesize

% first example: bad, there's an overfull of twice the rule width    
\verb|\includegraphics[width=\textwidth,frame]{tiger}|\\
\begin{minipage}{4cm}
\includegraphics[width=\textwidth,frame]{tiger}
\end{minipage}

\medskip

% second example: good, the frame is drawn outside the picture
\verb|\includegraphics[width=\dimexpr\textwidth-2\fboxrule,frame={\fboxrule}]{tiger}|\\
\begin{minipage}{4cm}
\includegraphics[width=\textwidth-2\fboxrule,frame={\fboxrule}]{tiger}
\end{minipage}

\medskip

% third example: good, the frame is drawn inside the picture
\verb|\includegraphics[width=\textwidth,frame={\fboxrule} {-\fboxrule}]{tiger}|\\
\begin{minipage}{4cm}
\includegraphics[width=\textwidth,frame={\fboxrule} {-\fboxrule}]{tiger}
\end{minipage}
\end{document}

Don't include the minipage environments, they are just to show the effect while using \textwidth (that's reset in a minipage) and not having a huge picture of the result.