BNP Chairperson Khaleda Zia has been admitted to Evercare Hospital in the capital for the third time this year.
She is suffering from various ailments including arthritis, said doctors following a health check-up this evening.
Earlier, she was taken to the hospital for follow-up treatment, nearly a week after she was discharged from the same hospital.
On 12 October, Khaleda was admitted to Evercare Hospital for the second time with fever and some other health complications.
She returned home on 7 November from the hospital after treatment for 26 days.
Khaleda's doctors said they discharged Khaleda from the hospital as her condition improved.
On 25 October, the BNP chief underwent a surgery and biopsy test at Evercare Hospital as she had a small lump in one part of her body.
Later, her biopsy report was sent to the USA and the UK for review and no sign of cancer was detected.
The BNP chief's doctors said she has been suffering from rheumatoid arthritis, diabetes, ophthalmological and dental complications.
Her family applied to the government twice in May and August this year seeking permission to take her abroad for better treatment, but the government turned it down saying there is no scope for a convicted person to avail of such a scope.
Earlier on 27 April, Khaleda was admitted to Evercare Hospital with Covid infections. She received treatment there until 19 June for post-Covid complications and some other underlying health problems.