The 82-year-old former president has not published any articles since December 15 and his 16-word salutation to the Cuban people on the 50th anniversary of the Cuban Revolution on January 1 did not resemble his writing style, El Universal reported.
Castro underwent intestinal surgery and ceded power to his younger brother Raul in July 2006 after ruling his country for 47 years. He has not appeared in public ever since.
His last photograph was published on November 18 last year after a meeting with Chinese leader Hu Jintao. Russian President Dmitry Medvedev also met with Castro in November, but no photos of the meeting were released.
On January 11, Hugo Chavez said that it is unlikely Fidel Castro will be seen in public again and that his image in uniform "will remain in our memories."
