Brown HK, et al. -Researchers examined how chronic physical conditions are associated with the risk of perinatal mental illness. In this population-based retrospective cohort study performed using linked health administrative data sets in Ontario, Canada, in 2005 to 2015, 77,385 women with chronic physical conditions were compared with 780,619 women without such conditions, all of whom had a singleton live birth. Observations revealed an increased risk of mental illness in correlation with chronic physical conditions such as diabetes, hypertension, and asthma. Perinatal mental illness was more frequent among women with (20.4%) than without (15.6%) a chronic physical condition. Across the timing and specific diagnosis of perinatal mental illness as well as the type of chronic physical condition, this risk was largely consistent.