  We discuss the possibility of detecting a Higgs boson in future collider
experiments if large extra dimensions are realized in nature. In such a case,
the Higgs boson can decay invisibly by oscillating into a graviscalar
Kaluza-Klein (KK) tower. We show that the search for such a Higgs at an $e^+
e^-$ linear collider entails more complications than are usually thought of in
relation to an invisibly decaying Higgs, the main sources of such complications
being the simultaneous presence of a continuum graviton production and the
broadening of the Higgs peak. We discuss possible ways of overcoming such
difficulties, and conclude that the detection of such a Higgs boson might still
be a problem beyond the mass range of 250-300 GeV.

High Energy Physics - Phenomenology