ZZ Top Drummer Frank Beard Suffering From Serious Health Issues

Frank Beard — the longtime drummer of the rock band ZZ Top — is dealing with serious health issues … and it’s so bad it’s affecting their tour … TMZ has learned.

The health update comes just days after ZZ Top cancelled their August 5 show at the Hollywood Bowl.

Sources tell TMZ … Frank’s health was the reason behind the cancellation.

At the time, frontman Billy Gibbons said on social media … “Insurmountable obstacles require canceling our Hollywood Bowl performance.”

Drummer John Douglas has subbed in for Frank in the past … like last year, when Frank briefly stepped away from the band “to attend to a health issue” … but in Frank’s recent absence, it’s been Michael Monahan.

Frank’s been with ZZ Top since 1969.