"He was about 19 years of age and suffering from obesity. He, along with his parents, was on way to Bangkok for treatment," airport police told PTI.
Doctors from Apollo clinic at the airport examined and declared the UAE national dead, airport police said adding the body was shifted to Apollo Clinic in the airport and the flight EK-374 left for Bangkok.
The boy weighed nearly 170 kg. According to Apollo doctors, he suffered heart failure that led to his death, police said.
"Emirates confirmed that flight EK 374 from Dubai to Bangkok was diverted to Hyderabad today due to a medical emergency involving one of the passengers. The flight eventually departed for Bangkok at 6.10 AM from Hyderabad, an Emirates statement said.
Police said arrangements are being made to send the body back to Dubai.