Aerosmith cancelled a Concord, California concert that was scheduled for Wednesday night.  According to the venue's Facebook page, an "illness" was cited as the reason for the cancellation.

Aerosmith's Facebook page also shared the cancellation news.  Refunds will be available for ticket buyers at their point of purchase.

A source close to the band tells TMZ that drummer Joey Kramer is having heart complications.  There is also an unconfirmed report that Kramer will undergo heart surgery.

Kramer, who is 64, has been with the band since Aerosmith formed in 1970.