Bentsen, 78, was admitted to St. Luke's Episcopal Hospital on Saturday after complaining of pain, and was later diagnosed with a kidney infection. He is expected to be released later this week, said hospital spokeswoman Maxsane Mitchell.
Bentsen spent 3 ½ months last year recovering from a stroke at a Galveston treatment center. He was hospitalized briefly in February 1998 after what doctors termed a minor stroke, then suffered a more severe stroke a week later and eventually was sent to the center for rehabilitation.
A Democrat, Bentsen served in the Senate from 1971 to 1993. He was Michael Dukakis' vice presidential nominee in their failed 1988 bid for the White House and served as President Clinton's first Treasury secretary until December 1994.