  We derive the expression for the thermal conductivity \kappa in the
low-temperature limit T \to 0 in d-wave superconductors, taking into account
the presence of competing orders such as spin-density wave, is-pairing, etc..
The expression is used for analyzing recent experimental data in
La_{2-x}Sr_xCuO_4. Our analysis strongly suggests that competing orders can be
responsible for anomalies in behavior of thermal conductivity observed in those
experiments.
