In a statement posted to Steven Tyler’s Twitter account on Tuesday (September 26), the singer announced that Aerosmith was cancelling their last four shows of the band’s South American tour due to unexpected, unspecified medical issues.

In a statement, Tyler said, “Please not to worry… I am not in a life threatening condition, but I need to deal with this right away, and get some rest and medical care immediately in order to sustain and maintain my future performances....I promise I'll be back...” Read the full statement below.

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— Steven Tyler (@IamStevenT) September 26, 2017