Postscriptum:

The 'dukkha' is of two kinds - kaayika and cetasika.

Arahants experience only 'kaayika', but not 'cetasika' dukkha:
http://www.accesstoinsight.org/canon/sutta/samyutta/sn36-006.html

And the 'cetasika dukkha' stems from the contact (phassa) of 'mano':

"Katama~nca, bhikkhave, dukkha.m? Ya.m kho, bhikkhave, kaayika.m
dukkha.m kaayika.m asaata.m kaayasamphassaja.m dukkha.m asaata.m
vedayita.m, ida.m vuccati, bhikkhave, dukkha.m.

"Katama~nca, bhikkhave, domanassa.m? Ya.m kho, bhikkhave, cetasika.m
dukkha.m cetasika.m asaata.m manosamphassaja.m dukkha.m asaata.m
vedayita.m, ida.m vuccati, bhikkhave, domanassa.m.

(Mahasatipatthana sutta)

So 'mano' plays a key role in how much one suffers.

Dmytro