Sen. John Fetterman was admitted to Walter Reed National Military Medical Center on Wednesday night for inpatient treatment of clinical depression.

According to a senior aide, Fetterman had been struggling with depression for weeks before the hospitalization, and the severity of the symptoms had taken both the staff and the senator himself by surprise.

The hospitalization comes amid reports that Fetterman has been struggling with serious mental health issues since suffering a stroke last year.

NBC News reporter Dasha Burns quoted a senior aide as saying it has been difficult to distinguish the stroke from the depression, and that Fetterman often finds it hard to understand the words that others are saying to him.

A senior aide tells me both the staff and Fetterman himself were taken by surprise by the severe onset of depression.

The aide also says this hasn't compromised his ability to do the job going forward, and he will be back to work once he has taken care of his mental health.

— Dasha Burns (@DashaBurns) February 17, 2023

Burns said:

A senior aide to Senator Fetterman tells me he will likely be in inpatient care for clinical depression for 'a few weeks.'

A senior aide says it’s been difficult to distinguish the stroke from the depression – saying it’s hard to tell at times if Fetterman is 'not hearing you, or is he sort of crippled by his depression and social anxiety.'

A senior aide tells me both the staff and Fetterman himself were taken by surprise by the severe onset of depression.

A senior aide also told NBC News that the senator's ability to do his job going forward has not been compromised, and that he will return to work once he has taken care of his mental health. Fetterman is expected to stay in inpatient care for a few weeks.

The decision to check Fetterman into the hospital was made after evaluation from Dr. Brian P. Monahan, the Attending Physician of the United States Congress.

The New York Times reported late last week that the stroke has taken a psychological toll on Fetterman and that he has had to come to terms with the fact that he may have set himself back permanently by not taking the recommended amount of rest during the campaign.

Fetterman’s office released a statement last Friday asserting that medical tests from the hospitalization returned negative results and that the senator was discharged.