A 60-year-old woman suffering from diarrhoea died at Meherpur General Hospital on Friday night.
The deceased was identified as Aslima Khatun, a resident of Maniknagar village in Mujibnagar upazila of the district.
As her condition deteriorated, she was taken to Meherpur General Hospital on Friday where she breathed that night, said Dr Mokhlesur Rahman of Meherpur General Hospital.
"We are waiting for the reports of her medical tests to determine the cause of her death," he said.
Bangladesh has been witnessing an alarming rise in diarrhoea cases since mid-March.
Some 250 people infected with diarrhoea are currently undergoing treatment at Meherpur General Hospital, said sources at the hospital.
Dr Md Nazmul Islam, a spokesperson for the Directorate General of Health Services (DGHS), on Wednesday said that necessary medicines for diarrhoea patients such as saline and water purification tablets were sent to hospitals.
Besides, around 23 lakh Dhaka residents will get two doses of the oral vaccine against cholera, he had said.
The first dose of the vaccine will be given in May and the second in June, said Dr Nazmul.