What This Means
This research followed over 7,200 adults in Jiangsu Province, China for approximately 11 years to examine whether symptoms of depression at the start of the study were linked to the later development of cardiovascular disease (CVD), cancer, or chronic obstructive pulmonary disease (COPD). Depression was measured using a standard questionnaire (PHQ-9) and participants were grouped by symptom severity. Disease cases were tracked through provincial health registries. Over the follow-up period, 692 cases of CVD, 362 cases of cancer, and 112 cases of COPD were recorded.
This research suggests that having depressive symptoms is associated with meaningfully higher risks of developing both CVD and COPD, and that these risks increase with the severity of depression. People with moderate-to-severe depressive symptoms (PHQ-9 ≥10) had twice the CVD risk and more than three times the COPD risk compared to those with no depressive symptoms, even after accounting for other factors. These associations were consistent regardless of sex, age, marital status, education, or smoking status. Interestingly, minimal depressive symptoms (PHQ-9 score 1–4) were associated with a lower cancer risk compared to a score of zero, though the reasons for this unexpected finding are unclear.
This research suggests that identifying and addressing depression may be an important component of efforts to prevent serious physical illnesses like heart disease and COPD. Incorporating mental health screening and intervention into the prevention and management of these chronic diseases could be beneficial, particularly in community health settings.