A number of years back, my dad, who had developed dementia after a surgery to correct problems from a World War II brain injury, was seized by sudden, horrendous pain. While Dad had to cope with considerable pain from arthritis and some back issues, this was different. I knew his pain was acute and extreme by his body language and vocalizations, even though he couldn't articulate exactly what was wrong. Dad generally had the ability to communicate, though.
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