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In theories with extra dimensions the Standard Model Higgs fields can beidentified with internal components of bulk gauge fields (Higgs-gaugeunification). The bulk gauge symmetry protects the Higgs mass from quadraticdivergences, but at the fixed points localized tadpoles can be radiativelygenerated if U(1) subgroups are conserved, making the Higgs mass UV sensitive.We show that a global symmetry, remnant of the internal rotation group afterorbifold projection, can prevent the generation of such tadpoles. In particularwe consider the classes of orbifold compactifications T^d/Z_N (d even, N>2) andT^d/Z_2 (arbitrary d) and show that in the first case tadpoles are alwaysallowed, while in the second they can appear only for d=2 (six dimensions).Comment: 10 pages, based on talks given by M.Q. at String Phenomenology 2004,  University of Michigan, Ann Arbor, August 1-6, 2004 and 10th International  Symposium on Particles, Strings and Cosmology (PASCOS'04 and Nath Fest),  Northeastern University, Boston, August 16-22, 200

TADPOLES AND SYMMETRIES IN HIGGS-GAUGE UNIFICATION THEORIES