  We construct TBA equations for D-type Argyres-Douglas theories with an SU(2)
flavor symmetry based on their spectral networks. We show that the solutions of
these TBA equations agree with the quantum periods of the corresponding quantum
Seiberg-Witten curves defined in the Nekrosov-Shatashvili limit of the Omega
background, including a centrifugal correction. We study the variety of TBA
systems across the Coulomb branch moduli space and find that they correspond to
the Dynkin diagrams of $D_n$ Lie algebras in the minimal chamber, and reproduce
the TBA equations for reflectionless D scattering theories at the maximally
symmetric point. Numerical computations demonstrate that the quantum periods
obtained from the Borel-Pad\'e resummation and their WKB expansions are in
agreement with the solutions of the TBA equations.
