  The excited states of charmonia are numerically investigated in quenched
lattice QCD with improved gauge and Wilson fermion actions formulated on
anisotropic lattices. Through a constrained curve fitting algorithm, the masses
of the first excited states in $0^{++}$, $1^{++}$, and $1^{+-}$ channels are
determined to be 3.825(88), 3.853(57), and 3.858(70) GeV, respectively.
Furthormore, a node structure is also observed in the Bethe-Salpeter amplitude
of the $1^{++}$ first excited state. These observations indicate that X(3872)
could be the first radial excitation of $\chi_{c1}$.
