Refugee Action Coalition spokesman Ian Rintoul said the asylum seeker named Omid had been on a hunger strike for more than a month and began excreting blood on Friday afternoon.
"We are gravely concerned for Omid ... it may be that Omid has already suffered permanent organ damage," he said.
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A spokeswoman for the Immigration Department told AAP the asylum seeker was taken to hospital on Friday for "further assessments".
She declined to provide further information.
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