the proton mass comes from the “spontaneous" breaking of chiral symmetry by the vacuum, with the order parameter given by the quark condensate $\la\bar{q}q\ra$. The mass so generated must therefore be connected intimately to the quark condensate. So in the chiral limit, one should be able to write the hadron mass as a function of the condensate as m=F(|[q]{}q). As an order parameter, the condensate $\la\bar{q}q\ra$ will be assumed to go to zero when chiral symmetry is restored. It may go to zero either in a smooth way or in a discontinuous way when the system is driven by the external condition - temperature or density - to the critical point. Now even if the condensate goes to zero smoothly, the $F$ which could be a complicated function of the condensate may go to zero in a discontinuous way. At present, there is no known analytical way to settle this issue using QCD proper. So how $F$ behaves as the critical point is reached is not known. But it seems very natural to expect that F(|[q]{}q)0  [as]{} |[q]{}q)0. This is basically the basis of Brown-Rho scaling [@BR:91] and is supported by Harada-Yamawaki’s hidden local symmetry theory with the “vector manifestation" 