Thinouia scandens is known from the Brazilian Atlantic forest (40–1200 m), in gallery forests, semi-deciduous forests, tabuleiro forests and ombropholius forests, Bahia, Espírito Santo, Minas Gerais, São Paulo and Rio de Janeiro.
Thinouia scandens possesses a wide EOO of 180,117.85 km² and an AOO of 136.00 km², with many known locations. However, the ombrophilous forest vegetation in southeast Brazil, where the species is found, is subject to continuing decline in area and quality of habitat due to anthropic pressure. Despite this, there are no data on population declines to apply other criteria and several conservation units in Brazil protect the species. Thus, it should be regarded as Least Concern (LC).