A spokesman for the leader said: ”The prime minister is suffering from a high fever and is coughing.”
Netanyahu’s personal physician believes the prime minister had not fully recovered from an illness two weeks ago and therefore decided he should undergo further tests at hospital, the spokesman said.
The veteran politician fell ill in mid-March and cancelled his public schedule for five consecutive days.
It came a day after police questioned the leader as part of a corruption investigation.
He was quizzed over his alleged dealings with the country’s largest telecommunication company, one of three cases weighing on his political future.
The 68-year-old has denied any wrongdoing and opinion polls show his popularity is still high.
Police have recommended he should be charged with bribery, fraud and breach of public trust.
Mr Netanyahu dismissed the remarks as “full of holes like Swiss cheese”.