According to the Cleveland Clinic, Parkinsonism is an umbrella term that refers to several brain conditions — including Parkinson’s disease — that cause slowed movements, rigidity (stiffness) and tremors. Parkinson’s disease makes up about 80% of all Parkinsonism cases.

The Eagles' co-lead guitarist since 2001, Steuart Smith, has retired midway through their Sphere stint, due to effects of Parkinson's disease.

After being diagnosed with Parkinsonism, Steuart Smith is retiring as lead guitarist for the Eagles. The 72-year-old musician, who has acted as the “Hotel California” band’s co-lead guitarist for almost 25 years alongside Joe Walsh,

Fans of “Hotel California” bid farewell to Eagles guitarist Steuart Smith, who has stepped away from the band due to a parkinsonism diagnosis, according to USA Today. Smith, a beloved figure in the band, leaves behind a legacy of unforgettable contributions to the Eagles’ sound.

Steuart Smith, the guitarist who has played with the Eagles since 2001, says he has to 'bow out' of the band after being diagnosed with Parkinsonism.

Veteran guitarist Steuart Smith, who's been touring with the Eagles for 24 years, revealed that his recent Parkinsonism diagnosis had a profound impact on his decision to retire