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 sideman who has served alongside Joe Walsh for 24 years as the Eagles’ touring co-lead guitarist, Steuart Smith, has officially retired from the group, taking his leave midway through the group’s stint at Sphere in Las Vegas.

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