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In this contribution I summarize and discuss the results of the bulkthermodynamic characteristics, meson and nucleon structure in hot matterobtained in the framework of a chiral quark-meson theory. A hybrid NJL model isused in which a Dirac sea of quarks is combined with a Fermi sea of quarks orof nucleons. In the model mesons are described as collective $\bar qq$excitations and the nucleon appears as a baryon-number-one soliton of $N_c$valence quarks coupled to both Dirac and Fermi sea. According to the model atsome critical density and/or temperature phase transitions from nucleons toquarks as well as from Goldstone to Wigner phase are expected. At finitedensity the chiral order parameter and the constituent quark mass have anon-monotonic temperature dependence-at temperatures not close to the criticalone they are less affected than in cold matter. The quark matter is rather softagainst thermal fluctuations and the corresponding chiral phase transition issmooth. The nucleon matter is much stiffer and the phase transition is verysharp. In the case of quark matter a first-order transition is suggested at lowtemperatures ($T<80$ MeV) which changes to a second-order one at highertemperatures. In contrast to the quark matter in the case of nucleon matter thethermodynamic variables show large discontinuities which is a clear indicationfor a first-order phase transition. In hot medium at intermediate temperaturethe nucleon soliton is more bound and less swelled than in the case of coldmatter. At some critical temperature, which for nucleon matter coincides withthe critical temperature for the phase transition, no more a localized solutionis found. According to this model scenario one should expect a first-orderphase transition from nucleon to quark matter.

What could be learned about phase transitions, meson and nucleon structure in hot medium from a chiral quark-meson theory?