Some 26 of the 166 terror suspects are now getting liquid nutrition, The Miami Herald reported Monday.
The number of inmates on a hunger strike has grown since officials at the U.S. base acknowledged a hunger strike was under way at a prison called Camp 6.
A shakedown at the camp in early February that included what the prisoners considered ill treatment of their Korans triggered the strike, lawyers for the inmates say.
Abd al-Hadi Faraj, a Syrian detainee who said he began his hunger strike is now reporting "severe and constant stomach pains, migraines, dizziness and vomiting blood," said his attorney, Ramzi Kassem, who talked to Faraj Friday.
Detention camp officials contend the episodes of blood vomiting are fake and are created by prisoners either spitting ketchup or biting their tongues.