20 Background: Chronic conditions and multimorbidity have been recognized to have negative impacts on costs of healthcare, quality of care, and well-being. The interdependence of patients and caregivers has also been highlighted, in that patient factors can impact caregiver outcomes and vice versa. Yet little research has been conducted on how the number of other health conditions among spouse caregivers (CGs) and advanced cancer patients impact their own and their partners’ well-being. Methods: Data were gathered as part of a prospective observational study of couples coping with advanced cancer. Patients had to have a cohabiting spouse/partner who identified as providing some care and also agreed to participate. Results: Patients rated their overall health slightly worse (scale 1-5, M = 2.85, SD = 0.95) than CGs ( M = 2.27, SD = 0.75). Patients also reported more total conditions ( M = 2.59, SD = 1.42) than CGs ( M = 1.4, SD = 1.14). Most patients (81%) reported at least one chronic condition other than cancer (44% of patients reported at least two other conditions); the most common conditions among patients were hypertension (43%), lung disease (36%), arthritis, and diabetes (both 24%). About 23% of CGs reported having no chronic conditions; 36% reported at least one and 41% reported at least two. The most common conditions among CGs were arthritis (40%), hypertension (39%), and heart disease, diabetes, and cancer (13% each). A greater number of CG conditions predicted greater depression symptoms in the patient ( B = 0.60, p = .040), controlling for patient conditions. More conditions among patients was a significant predictor of less patient social support ( B = -0.67, p = .017) and a marginally-significant predictor of greater perceived stress among caregivers ( B = -0.27, p = .064). A history of CG cancer predicted greater depression symptoms in the patient ( B = 2.3, p = .02). Conclusions: Chronic conditions and multimorbidity can have significant psychological consequences for both patient and CG. Clinicians, in addition to making an active effort to incorporate CGs into medical decision making and treatment planning, should also be aware of patient and caregiver multiple chronic conditions in order to provide more holistic care for patients.