The nonlinear evolution of the internal kink mode is studied in toroidal geometry for noncircular cross‐section tokamak plasmas. The study is focused on very low‐shear and hollowqprofiles, withq(&rgr;)≥1 for which the internal kink is unstable in the latter case, even at &bgr;=0. The nonlinear evolution is dominated by ideal magnetohydrodynamics (MHD), and the instability saturates, giving a quasihelical shift to the magnetic axis. The nonlinear saturation is caused by increased field line bending. Time scales of 103&tgr;Hpand axis shifts of 20% are reached when changes inqon the order of 3×10−3from the marginal profile are produced.