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.

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

Steuart Smith, the longtime touring guitarist for legendary rock band the Eagles, has retired because of health issues.

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

Steuart Smith, the longtime touring guitarist for the Eagles, on Monday announced his retirement due to complications from Parkinsonism.