Dr Arthit Jiaranaisilawong, assistant director of Praram 9 Hospital, said Yingluck’s condition has improved though she still showed signs of fatigue.
“The premier is suffering from food poisoning. She will be under observation at the hospital at least until this evening. She is now better but appears tired. If her condition is better, she could be discharged from the hospital today. If not, the doctors would like to examine her again tomorrow,” the doctor said.
Doctors suspect her condition may be caused by seafood Yingluck ate on Monday. They have recommended that she rests for a few days, he said.
Yingluck was admitted to the hospital around 3pm after suffering vomiting, diarrhoea and fatigue.
Whether Yingluck can travel to Vietnam on Wednesday for an official visit depends on her condition, the doctor said. All her appointments on Tuesday including the weekly cabinet meeting have been cancelled due to her illness.
Deputy Prime Minister Yongyuth Wichaidit chaired the meeting on her behalf.
This is the second time that Yingluck has been absent from the cabinet meeting. On November 15, she was stranded in Sing Buri province after visiting flood-hit victims. Deputy Prime Minister Chalerm Yoobamrung chaired the meeting as Yongyuth was with Yingluck in Sing Buri.
The November 15 meeting became controversial as the cabinet considered royal pardon bill for convicts in commemoration of HM the King's birthday on December 5.
The bill draft was reportedly amended to cover Yingluck's brother, fugitive ex-PM Thaksin Shinawatra. Yingluck's absence from the meeting was criticised as being deliberate to distance herself from the matter.