  The effects of nuclear medium on the residue, mass and self energy of the
positive and negative parity $\Sigma$, $\Lambda$ and $\Xi$ hyperons are
investigated using the QCD sum rule method. In the calculations, the general
interpolating currents of hyperons with an arbitrary mixing parameter are used.
We compare the results obtained in medium with those of the vacuum and
calculate the shifts in the corresponding parameters. It is found that the
shifts on the residues in nuclear matter are over all positive for both the
positive and negative parity hyperons, except for the positive parity $\Sigma$
hyperon that the shift is negative. The shifts on the masses of these baryons
are obtained to be negative. The shifts on the residues and masses of negative
parity states are large compared to those of positive parities. The maximum
shift belongs to the residue of the negative parity $\Lambda$ hyperon. The
vector self-energies gained by the positive parity baryons are large compared
to the negative parities' vector self-energies. The maximum value of the vector
self-energy belongs to the positive parity $\Sigma$ hyperon. The numerical
values are compared with the existing predictions in the literature.
