July 24, 2011 - Successfully undergoes first round of chemotherapy in Cuba.
August 7-14, 2011 - Returns to Cuba for second round of chemotherapy.
September 18-22, 2011 - Chavez travels to Cuba for another round of chemotherapy.
September 25, 2011 - An audio recording of Chavez airs on Venezuelan state-run television, assuring listeners he is recovering successfully from his last round of chemotherapy.
October 20, 2011 - After five days of medical tests in Cuba, Chavez says he's beaten cancer. "There are no malignant cells in this body. They don't exist," he says.
February 21, 2012 - Chavez says that he will need to undergo surgery to remove a lesion, roughly two centimeters in diameter, from the same area where doctors removed a cancerous tumor from his body in June of 2011.
February 24-March 16, 2012 - In Cuba for cancer treatment.
March 25-March 29, 2012 - In Cuba for cancer treatment.
March 31-April 4, 2012 - In Cuba for cancer treatment.
April 7-11, 2012 - In Cuba for cancer treatment.
April 14, 2012 - Chavez is unable to attend the Summit of the Americas in Colombia due to illness.
April 26, 2012 - Returns to Venezuela from Cuba after another round of cancer treatments.
May 2, 2012 - Names ten Venezuelans to an influential commission called the Council of State. It is the highest circle of advisers to the president, but has never actually been formed. The timing of the appointments is significant, as speculation increases over who will succeed Chavez if he becomes too ill to govern, or if he dies.
May 1-11, 2012 - In Cuba for cancer treatment.
July 9, 2012 - Chavez declares that he is cancer-free.
October 7, 2012 - Wins re-election as president for a new six-year term.
November 28, 2012 - Arrives in Cuba for another round of medical treatment.
December 7, 2012 - Returns to Venezuela from Cuba after receiving hyperbaric oxygen treatment.
December 8, 2012 - In a televised announcement, Chavez reveals his cancer has returned and that he will return to Cuba in two days for more surgery. Vice President Nicolas Maduro is named by Chavez to succeed him should his health worsen.
December 11, 2012 - Chavez undergoes six hours of surgery in Havana, Cuba.
December 30, 2012 - According to Vice President Nicolas Maduro, Chavez is suffering from "new complications" and his health remains "delicate."
January 3, 2013 - Venezuelan Information Minister Ernesto Villegas says in a televised statement that Chavez is suffering from a "severe" lung infection and "respiratory insufficiency."
January 9, 2013 - Venezuela's Supreme Court rules that Hugo Chavez will remain president even though he is unable to attend his inauguration, scheduled for January 10th.
February 18, 2013 - Chavez returns to Venezuela from Cuba. He announces his return via Twitter saying, "We come back to the country of Venezuela. Thank God! Thank you dear people! Here we continue the treatment."
March 4, 2013 - Information Minister Ernesto Villegas announces on state-run TV that Chavez is battling a new and "severe" infection and that his condition remains "delicate."