Singhal was admitted to Medanta multi-speciality hospital late last night.
According to a VHP statement, doctors attending on him at Medanta multi-speciality hospital say that his condition is "critical". Singhal is suffering from respiratory problems for over a month now.
Singhal was earlier admitted to Medanta on October 20 after his condition deteriorated in Allahabad and was flown in to the national capital in an air ambulance. He was discharged only two days ago.
BJP President Amit Shah and party's general secretary (Organisation) Ramlal, besides Union Health Minister J P Nadda today visited him at the hospital and inquired about his health.
Keeping in view Singhal's bad health, VHP has cancelled its 18-day Chaturved Swahakar Yajna that was slated to start at Delhi's Birla Mandir from November 16, as well as its Diwali Milan programme.