Sen. Dianne Feinstein, D-Calif., is receiving treatment for shingles in a California hospital, Fox News Digital has confirmed. 

"I was diagnosed over the February recess with a case of shingles. I have been hospitalized and am receiving treatment in San Francisco." Feinstein's office shared. "I hope to return to the Senate later this month."

Dianne Feinstein

Sen. Dianne Feinstein, D-Calif., announced last month that she will not seek re-election in 2024. (Tom Williams/CQ-Roll Call, Inc via Getty Images)

Feinstein, 89, said she expects to make a "full recovery." 

Shingles typically develops in older adults who had chicken pox, or the varicella-zoster virus, when younger. Its hallmark is a painful rash that clears up within a month in most cases, but can sometimes lead to nerve pain that can linger for longer.

Sen. Dianne Feinstein

Feinstein has represented California since 1992 and is the oldest sitting senator at age 89. (Tom Williams/CQ-Roll Call, Inc via Getty Images)

On Feb. 14, Feinstein's office announced that she will not seek re-election in 2024.

"I am announcing today I will not run for re-election in 2024 but intend to accomplish as much for California as I can through the end of next year when my term ends," Feinstein said in a statement.

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Feinstein has represented the Golden State since 1992 and is the longest-serving female senator ever, as well as the oldest sitting senator at age 89.