Six black binliners full of clinical waste including hundreds of syringes have been found in a lay-by near Kendal.
John Barwise from South Lakeland council said the bags were reported by a member of the public and found to contain eight of the tubs used in clinics and hospitals to collect hazardous waste.
He said the labels appeared to have been been scratched off so the source could not be identified.
The bags are thought to have been fly-tipped over the weekend in the lay-by on the A6 between Kendal and Selside.
To dump this sort of waste in a public place is highly irresponsible, illegal and potentially dangerous."