"Jyoti Basu has sustained a rib fracture on the right side of his chest after falling in the bathroom. He has been advised complete bed rest by the doctors," said Basu's personal assistance Joy Krishna Ghosh.
He said the 93-year-old leader was under medical observation at his residence under Bidhannagar Hospital's orthopaedic department and his personal physician A.K Maity.
"An X-ray was done at Basu's Indira Bhavan residence. The doctors are also monitoring his condition," Ghosh told IANS.
Born July 8, 1914 in Kolkata, Basu led the communists to power in West Bengal five times in a row from 1977.
He relinquished his office as chief minister for health reasons in November 2000. But as CPI-M politburo member, he continues to play a big role in the party and in national politics.