'express pain' is correct and usable in written English.
You can use it when you want to describe the physical or emotional sensation of pain. Example: I try to express my pain through music so it has some kind of purpose.
The reader remembers that neither the father nor the son was able to express pain -- or affection -- directly.
Denied every human and judicial right, the inmates were also refused the one prerogative of the tortured: the right to express pain.
Novelists are much more interested in the inner life of human beings -- what they feel, how they experience and express pain, the insults and indignities that drive some people to exact a pound-of-flesh vengeance.
I'm trying to express pain and fear; the fear that comes right before the violence, because you don't know when it's going to come, and the pain that comes straight after.
They argue they are at greater risk from infectious disease; that their fertility rate is lower; that year-round housing deprives highly-developed, sentient creatures who can feel and express pain, pleasure and fear, of the right to express natural behaviours.
Professor Jeffrey Mogil of McGill University and the University of British Columbia in Canada, said that the resulting "mouse grimace scale" was similar to the way humans express pain and could be used to assess how much discomfort animals feel during vital medical experiments aimed at alleviating pain.
Or subjects expressing pain and fear?
When her body crumpled or caved, it appeared to be expressing pain.
But they often expressed pain through agitation or grimacing, she said, adding, "Err on the side of treating them" with pain-controlling drugs.
The much talked about (but rarely publicly expressed) pain within Republican communities is real enough (subscription required).
It did not suffice and the patients expressed pain.
