While standing vigil at her Havana house, supporter Idania Yanez said Martha Beatriz Roque is in a "very delicate" condition.
Roque is a 67-year-old state-trained economist turned dissident leader. Among other things, she's demanding the government release a little-known opposition prisoner who she says was due to leave jail more than a week ago.
She has been joined in her protest by more than two dozen other dissidents around the country. Monday marked a week without food for the protesters. The government considers Roque and other dissidents common criminals.