Singh was admitted to I G Medical College in Shimla around 1.30 AM where his condition is stated to be stable now, the hospital's Senior Superintendent Dr Ramesh said, adding the chief minister is kept under observation.
"All the tests are normal and he is stable. He is being kept under observation," the doctor said.
State Governor Acharya Dev Vrat visited the hospital in the morning to inquire about Singh's health.
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