Thanks for the advice. I was wondering why LaTeX didn't take care of
this issue (as usual). Here is an example which I hope helps
explaining my case:
\documentclass[12pt]{article}
\usepackage{fullpage}
\usepackage{fancyhdr}
\usepackage{geometry}
%\headsep 3pt %Solves the problem but... is there a better solution?
\pagestyle{fancyplain}
\lhead{}
\chead{Header Center}
\rhead{}
\rfoot{\thepage}
\cfoot{Footer Center}
\lfoot{\tiny Some notes at the end of the page.\\ And the notes
continue here.}
\title{Some Title}
\author{Author(s) list}
\date{date}
\begin{document}
\maketitle
\section{Section One}
Text text text text text text text text text text text text text
text text text text text text text text text text text text text
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\section{Section Two}
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\section{Section Three}
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\section{Section Four}
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text text text text text text text text text.
\end{document}
Uncommenting the \headsep statement would solve the problem, however
this is not the most preferable solution, since it alters the page
calibration. Any suggestion.