The relation is analyzed between the diamagnetic signal and the current and pressure of anisotropic plasma in a tokamak. Such a relation is well-known for the cylindrical plasma with a circular cross section, but, in this study, the plasma shape is assumed to be arbitrary, and both the system toroidicity and plasma anisotropy are accounted for. This considerably complicates the calculations and requires the integration of the generalized Grad–Shafranov equation. The analytical derivations are performed by the scheme used for the isotropic plasma in [V. D. Pustovitov, Fusion Eng. Des. 117, 1 (2017)]. Estimates are made for a large group of terms arising due to the anisotropy, and the main effect is extracted. The result is ready for practical use.