A large number of workers are hiding mental health conditions from their employers because they fear it will affect their job prospects, according to a new study. A survey of 2,000 adults showed that two out of every five workers have suffered from stress, anxiety or depression in the past year, but have not shared this with their boss. Of these polled, one in four said they had taken a day off sick, explaining it was for a physical rather than mental health problem. An excessive workload, frustration with bad management and long working hours were the main causes for stress, with more than half of those polled admitting they felt their career prospects would be damaged if they were open about stress or anxiety in the workplace. The study, conducted by Friends Life insurance, found younger workers are most at risk of developing depression or anxiety. Andy Briggs, group chief executive of Friends Life, said: "Our research shows that there is still much to be done in tackling mental health issues in the workplace. Anxiety, stress and depression can affect anybody and employees need help and support so that they are not left feeling vulnerable and demotivated." If you or someone close to you is affected by depression or anxiety, check in with one of these free service groups here for confidential advice, support and information.