In reply to Akvan,
I think dukkha can also be of the nature of kamma vipaka. I think this can also be true for phenomena like irritation, tension, fire in the mind. My impression is this can be of the nature of kamma vipaka too.
Sometime their seems to be no direct reason to be irritated or heated up. There are no direct circumstances, no frustrated desires etc. But still, mind can be in an irritated heated up state.
In my own life i can see a lot of dukkha that is of the nature of kamma vipaka. Lal also emphasizes this. If we do not stay away from immoral deeds, mind will heat up. This is true.
What also is true, even when one stays away from dasa akusala one can still experience old negative kamma ripening. It is my experience this will happen. Staying away from dasa akusala helps preventing future suffering but it does not stop kamma vipaka from arising.
The sutta’s teach we must contact that ripening kamma and wear it out, not react and stay away from making new bad kamma.
Siebe