In this paper, we study the existence of periodic solutions for Rayleigh equation with a singularity of repulsive typewhere α ≥ 1 is a constant, and ϕ and p are T-periodic functions. The proof of the main result relies on a known continuation theorem of coincidence degree theory. The interesting point is that the sign of the function ϕ(t) is allowed to change for t ∈ [0, T].