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We study the two-pion propagator in the nuclear medium. This quantity appearsin the $\pi-\pi$ T-matrix and we show that it also enters the QCD scalarsusceptibility. The medium effects on this propagator are due to the influenceof the individual nucleon response to a scalar field through their pion clouds.This response is appreciably increased by the nuclear environment. It producesan important convergence effect between the scalar and pseudoscalarsusceptibilities, reflecting the reshaping of the scalar strengh observed in$2\pi$ production experiments. While a large modification of the $\sigma$propagator follows, due to its coupling to two pion states, we show that the NNpotential remains instead unaffected.Comment: 14 pages, 4 figures, submitted to EPJ

Two-pion production processes, chiral symmetry and NN interaction in the medium