Hadron modifications in nuclear matter are discussed in connection to chiral symmetry restoration and/or hadronic many body effects. Experiments with photon, proton and heavy ion beams are used to probe properties of hadrons embedded in nuclear matter at different temperatures and densities. Most of the information was gathered for the light vector mesons ρ , ω and ? . HADES is a second generation experiment operating at GSI (Darmstadt) with the main aim to study in-medium modifications by means of dielectron production at the SIS18/Bevelac energy range. Large acceptance and excellent particle identification capabilities allow also for measurements of strangeness production. These abilities combined with the variety of beams provided by the SIS18 lead to a characterization of properties of the dense baryonic matter properties created in heavy ion collisions at these energies. A review of recent experimental results obtained by HADES is presented, with the main emphasis on hadron properties in nuclear matter.
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