Media descended on the hospital as news spread that ex-PM Mahathir Mohamad had been admitted again, and current Prime Minister Ismail Sabri Yaakob also paid him a visit.
The 96-year-old former prime minister has had heart problems in the past, having suffered several heart attacks and undergone bypass surgery.
Former Malaysian prime minister Mahathir Mohamad has had heart problems in the past, suffering several heart attacks and undergoing bypass surgery.
Malaysian Prime Minister Muhyiddin Yassin resigned less than 18 months into his tenure, becoming the country's shortest-ruling leader after conceding that he lost majority support to govern.
The Southeast Asian nation has been in turmoil since a reformist government headed by Mahathir Mohamad, which included Anwar, collapsed in February amid bitter infighting.
Former prime minister Mahathir Mohamad, who resigned last month, cautioned that the party accused of graft at 1MDB was back in power. At least six countries are investigating financial crimes at 1MDB, founded by then-premier Najib Raza.
Former premier Mahathir Mohamad said he no longer commanded a majority in parliament after some supporters abandoned him to join Prime Minister Muhyiddin Yassin camp.
The swearing-in capped a week of turmoil that began with Mahathir's resignation in an apparent bid to consolidate power, but ended with him sidelined and complaining of betrayal after decades dominating Malaysian politics.
Malaysia's king appoints seasoned politician Muhyiddin Yassin as new PM but Mahathir Mohamad says he has support of 114 lawmakers for a comeback as prime minister for a third time.
The move averted a showdown between the men whose struggle has shaped Malaysian politics for two decades, but which risked sidelining both and returning to power the corruption-tarnished former ruling party they had defeated.
King Sultan Abdullah Sultan Ahmad Shah accepted Mahathir Mohamad's resignation but also asked him to continue until a new government is formed.
Although Mahathir Mohamad's sudden departure from the top post came as a surprise to many political pundits, the country's power corridors have been strife with political bickering over the past week.
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