ObjectivesThe primary aim was to investigate the impact of complaints on doctors’ psychological welfare and health. The secondary aim was to assess whether doctors report exposure to a complaints process is associated with defensive medical practise.DesignThis was a cross-sectional anonymous survey study. Participants were stratified into recent/current, past, no complaints. Each group completed tailored versions of the survey.Participants95 636 doctors were invited to participate. A total of 10 930(11.4%) responded, 7926 (8.3%) completed the full survey and were included in the complete analysis.Main outcome measuresAnxiety and depression were assessed using the standardised Generalised Anxiety Disorder scale and Physical Health Questionnaire. Defensive practise was evaluated using a new measure. Single-item questions measured stress-related illnesses, complaints-related experience, attitudes towards complaints and views on improving complaints processes.Results16.9% of doctors with current/recent complaints reported moderate/severe depression (relative risk (RR) 1.77 (95% CI 1.48 to 2.13) compared to doctors with no complaints (9.5%)). Fifteen per cent reported moderate/severe anxiety (RR=2.08 (95% CI 1.61 to 2.68) compared to doctors with no complaints (7.3%)). Distress increased with complaint severity, with highest levels after General Medical Council (GMC) referral (26.3% depression, 22.3% anxiety). Doctors with current/recent complaints were 2.08 (95% CI 1.61 to 2.68) times more likely to report thoughts of self-harm or suicidal ideation. Most doctors reported defensive practise: 82–89% hedging and 46–50% avoidance. Twenty per cent felt victimised after whistleblowing, 38% felt bullied, 27% spent over 1 month off work. Over 80% felt processes would improve with transparency, managerial competence, capacity to claim lost earnings and action against vexatious complainants.ConclusionsDoctors with recent/current complaints have significant risks of moderate/severe depression, anxiety and suicidal ideation. Morbidity was greatest in cases involving the GMC. Most doctors reported practising defensively, including avoidance of procedures and high-risk patients. Many felt victimised as whistleblowers or reported bullying. Suggestions to improve complaints processes included transparency and managerial competence.