According to People his rep announced that, Isaac Hanson, the oldest member of the group the Hanson brothers, was hospitalized in Texas for pulmonary embolism.
The 26-year-old musician was taken to the hospital because he had severe pain in his shoulder and chest after his concert Tuesday night in Dallas.
His rep explained, "He underwent several tests throughout the night and has been diagnosed with pulmonary embolism. Isaac is currently undergoing treatment and will be re-evaluated shortly by doctors."
The Hansons had to cancel their show in Tulsa. Isaac Hanson became a father for the first time in April.