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Breathlessness is a prevalent and distressing symptom in intensive care unit patients. There is little evidence of the ability of healthcare workers to assess the patient's experiences of breathing. Patient perception of breathing is essential in symptom management, and patient perception during a spontaneous breathing trial (SBT) might be related to extubation success.To assess mechanically ventilated patients' experiences of breathlessness during SBT.This was a prospective observational multicenter study of 100 mechanically ventilated patients. We assessed the agreement between nurses, physicians, and patients' 11-point Numerical Rating Scales scores of breathlessness, perception of feeling secure, and improvement of respiratory function at the end of an SBT (most performed with some level of support). We also determined the association between breathlessness and demographic factors or respiratory observations.Sixty-two patients (62%) reported moderate or severe breathlessness (Numerical Rating Scales ≥ 4). The median intensity of breathlessness reported by patients was five compared with two by nurses and physicians (P0.001). Patients felt less secure and reported less improvement of respiratory function compared with nurses' and physicians' ratings. About half of the nurses and physicians underestimated breathlessness (difference score, ≤-2) compared with the patients' self-reports. Underestimation of breathlessness was not associated with professional competencies. There were no major differences in objective assessments of respiratory function in patients with moderate or severe breathlessness, and no apparent relationship between breathlessness during the SBT and extubation outcome.Patients reported higher breathlessness after SBT compared with nurses and physicians. Clinical trial registered with www.clinicaltrials.gov (NCT 01928277).