Stress levels among teachers in England's classrooms are soaring, a BBC investigation has found. Unions are blaming workload for large numbers of staff taking time off work or leaving the profession. Insurance industry data suggest stress is the biggest cause of staff absence save for maternity. The Department for Education insists it is working ‘to tackle the issue of unnecessary workload which we know can lead to stress’. The BBC has also seen a survey of 3,500 members of the NASUWT teaching union which shows more than two-thirds of respondents considered quitting the profession in the past year. Workload was the top concern, with 89% citing this as a problem, followed by pay (45%), inspection (44%), curriculum reform (42%) and pupil behaviour (40%). In addition: NASUWT General Secretary Chris Keates described the results as ‘frightening’. Education Secretary Nicky Morgan Education Secretary Nicky Morgan has expressed her concerns over excessive working hours.