Doctors, hospital personnel, and even family members often fail to detect postpartum psychosis not just because the condition is rare, but because women experiencing it may not overtly show symptoms. A key difference between PPD and postpartum psychosis is that the disturbing thoughts that are a symptom of both cause great anxiety and distress to mothers with PPD, but may not overtly trouble those experiencing psychosis; a mother expressing concern about her thoughts, therefore, is more likely dealing with PPD and may be easier to diagnose, while a woman with the more dangerous condition may go undiagnosed.