The non-odd restoring force function of the eardrum model equation is being discussed. It has been noted that the eardrum model equation is subjected to asymmetric loading and experiences unequal oscillations for both positive and negative amplitudes. In this study, the researchers solve the nonlinear second-order differential equation of the eardrum model using the homotopy perturbation method. A comparison is made between the solution obtained through the homotopy perturbation method and the analytical method.