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 musician who has served alongside Joe Walsh for 24 years as the Eagles’ 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.

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.