Cancer is still one of the principal causes of morbidity and mortality around the world, second only to cardiovascular disease. It is estimated that in 2018, the deaths caused by cancer reached 9.6 million, with 18.1 million new cancer diagnoses, showing an increasing trend, as in 2012 the cancer incidence was 14 million worldwide (Bray et al., 2018). In Spain, the data show a similar pattern, with cancer as the cause of 427,721 deaths, and the new cancer diagnosis rate keeps growing from 247,721 in 2015-277,234 in 2019 (Sociedad española de Oncología Médica [SEOM], 2020).Patients diagnosed with cancer experience an alteration in their life course, modifying some levels of their lives: physical, psychological, social, work and economic. This situation also affects their families or close relatives who act as caregivers (Asociación Española Contra el Cáncer [AECC], 2019;Stanton et al., 2015). An informal caregiver can be defined as an individual who provides care to the cancer patient and is not paid to do so, usually without
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