Doctors who checked on Jagan said he has very high temperature and is dehydrated.
Jagan has been on fast since Saturday and as his condition has continued to deteriorate.
The doctors have advised him to take fluids failing which he may slip into coma as his sugar levels are dangerously low.
The state administration has been requesting him to call off his protest, but the YSR Congress leader is adamant. He says that unless the decision is reversed he will continue his fast. The police have however decided to forcibly admit him to hospital.