Living Arahants can experience only the “saririka vedana” in the physical body (like injuries, sicknesses, etc.) They do not experience “mental suffering.”
One could think of Sankhara dukkha, viparinama dukkha, and dukkha dukkha as dukkha vedana.
But they are also the CAUSES of future suffering.
Arahants do not engage in those and also are not affected by them.
There are many ways to think about Sankhara dukkha, viparinama dukkha, and dukkha dukkha.
For example, when someone attaches to an arammana, they start doing sankhara with avijja. That leads to “heating the mind” while doing them and also leads to future suffering.
Whenever one is engaged in “avijja paccaya sankhara,” that moves them away from the “pabhassara mind.” That is going backward or “viparinama.”
Whenever a mind attaches to a “disliked arammana,” that causes “heating or stress in mind.” But then they keep thinking about it and generate more “stressful thoughts,” and that leads to a second round of suffering based on the same arammana. P.S. The Buddha compared that to being pierced by a spear twice: “Salla Sutta (SN 36.6.)“
I will write about those in upcoming posts. We can see various levels of suffering depending on how deep one goes!