It's been revealed staff at schools in Hull, including academies, were off nearly 3,700 days due to sickness in the last school year.
The figures have been revealed to KCFM in a Freedom of Information request.
At East Riding Council maintained schools, where the figure is calculated differently, staff took an average of nearly 6 days off in the last year.
20 teachers in the East Riding took long-term sickness last school year due to stress-related illness - four times the figure 2 years previous.
Ken Rustidge represents the region for the National Union of Teachers and says it's just the tip of the iceberg.
He says: "Much of this can be blamed straight on the Government policy. These massive changes and people having to work ridiculous hours and it mounts up.
"Added to that teachers will be in contact with children, with it being in primary or secondary, and inevitably they're going to come into contact with germs."
The Department for Education says they are committed to tackling issues that could affect teacher's health and well-being and are working to strip away workload that doesn't add value.