Elastic energy dissipation (internal friction) peaks, arising from both stress-induced, bulk lattice rearrangements of hydrogen interstitials (H (1) peak) and hydrogen dislocation interactions (H (2) peak), have been investigated over a wide range of the hydrogen content in alpha+ beta and beta phase concentration ranges of the Pd-H system during both absorption and desorption of hydrogen. It has been confirmed that the H (1) peak is associated with a Zener type of relaxation process. In beta phase regions, asymmetries of the H (1) peak have been observed, which may be accounted for by a Curie-Weiss law type of temperature dependence of the relaxation strength. Differences in the degree of short-range order in beta phase regions have been suggested by the form of the dependence of relaxation strength upon hydrogen content. It has been found that the H (2) peak only appears significantly in alpha phase and alpha+ beta phase concentration ranges.