Democratic Sen. Dianne Feinstein of California arrives for a Senate briefing on China at the US Capitol on February 15, 2023.
CNN  — 

Sen. Dianne Feinstein, the 89-year-old Democrat from California, announced Thursday that she was hospitalized and receiving treatment for shingles, hoping to return to Washington later this month.

Feinstein’s absence could influence Democratic strategy in the chamber as the Democratic Caucus controls the Senate by a 51-49 margin, and Sen. John Fetterman has also been hospitalized since last month for treatment for depression.

“I was diagnosed over the February recess with a case of shingles,” Feinstein said in her statement. “I have been hospitalized and am receiving treatment in San Francisco and expect to make a full recovery. I hope to return to the Senate later this month.”

Feinstein announced earlier this year that she would not seek reelection in 2024.