A consultant surgeon from Derby is travelling to Pakistan to help with the relief effort.
Twenty million people are now estimated to have been affected by the floods.
Dr Syed Yusuf Iftikhar is chairman of the charity Midlands Doctors Association UK, which helped victims of the north Pakistan earthquake in 2005.
His colleague at the Royal Derby Hospital Dr Javed Ahmed, who organises the charity's UK effort, said they were meeting the most basic needs.
He said: "Our staff on the ground (told us) that people basically need food to live.
"So we directed all our effort into supplying food packages and currently daily we're supplying about four-to-five-hundred families food which they can sustain for about three to four weeks.
"The commonest (medical) problems are water-borne diarrhoeal diseases.
"Skin disorders are a huge problem, eye problems are becoming very common.
"People are sitting surrounded by pools of dirty water. They are really suffering a lot of diseases including malnutrition and lack of clean drinking water."
The charity is also helping out with sustainable drinking water schemes which include digging wells and providing hand-pumps.