In this work Raman excitation profiles of metallic carbon nanotubes have been calculated and thoroughly analyzed. Suppression and vanishing of the high-energy resonance is completely confirmed by our calculations. The presented results clearly show that the suppression, and finally the absence, of the resonance is caused by electron–phonon interaction and interference effects. Electron–phonon coupling for low-energy resonance is significantly larger than for high-energy resonance. Furthermore, the transition energies of those two transitions are close enough to make interference effects important. The type of interference is determined by the sign of the electron–phonon interaction matrix elements. Constructive interference makes the low-energy resonance more intensive and destructive interference destroys the high-energy resonance for most of the metallic tubes.