The persistent discrepancy between early-universe and late-universe determinations of the Hubble constant represents one of the most significant open problems in contemporary cosmology. Standard interpretations typically attribute this “Hubble tension” to unknown new physics or systematic uncertainties within the ΛCDM framework.In this work, the tension is reinterpreted within the MyominAung Photon-Sea Theory (MATE) as an observational consequence of photon propagation through a structured vacuum medium. In the MATE framework, cosmological redshift arises from cumulative energy dissipation due to photon–medium interaction rather than purely from metric expansion. Photon frequencies evolve during propagation, while temporal pulse spacing remains invariant.An effective Hubble parameter is derived from a single medium-dependent decay parameter, constrained independently by other MATE phenomenological studies. This parameter naturally yields an intermediate effective value of the Hubble constant, reconciling early-universe (CMB-based) and late-universe (distance-ladder-based) measurements without introducing additional cosmological components or modifying General Relativity.The analysis suggests that the Hubble constant is not a universal fundamental constant, but an emergent, environment-dependent effective parameter reflecting variations in photon-sea density. This interpretation provides a physically grounded and testable alternative perspective on the Hubble tension problem.