Burnout remains a concern among employees in the US, according to a survey by Robert Half International Inc. The survey of workers in select industries found that 38% reported being more burned out now than a year ago.

“Despite employers’ efforts to better support employee well-being, burnout is an issue that needs ongoing attention,” said Paul McDonald, senior executive director of Robert Half. “Compounding the matter, businesses are moving forward with an influx of new projects, putting more pressure on current staff who may already be stretched thin.”

According to the survey, the top factors contributing to burnout are heavy workloads, 56%; lack of communication and support from management, 32%; and insufficient tools and resources to perform effectively, 27%.

Employees with the highest burnout levels include millennials, working parents and workers who have been with their company for two to four years.

The report also found that 37% of employees feel uneasy about expressing feelings of burnout with their boss. One in five workers said their manager had not taken steps to help them alleviate work-related stress.

However, the report noted some employees have been receiving support. Among those who reported receiving support, 26% have been encouraged to take time off, 24% were provided greater schedule flexibility and 22% were given guidance on prioritizing projects.

The online survey was developed by Robert Half and conducted by an independent research firm from May 4 to May 26. It includes responses from more than 2,400 workers in finance, technology, marketing and creative, legal, administrative and customer support, and human resources at companies with 20 or more employees in the US.