  We discuss various aspects of pion physics in the nuclear medium. We first
study s-wave pion-nucleus interaction in connection with chiral symmetry
restoration and quark condensate in the nuclear medium. We then adress the
question of p-wave pion-nucleus interaction and collective pionic modes in
nuclei and draw the consequences for in medium $\pi\pi$ correlations especially
in the scalar-isoscalar channel. We finally discuss the modification of the rho
meson mass spectrum at finite density and/or temperature in connection with
relativistic heavy ion collisions.
