Objective: As the number of informal caregivers and their caregiving responsibilities increase, this study aims at evaluating caregiver distress, quality of life (QoL) and their predictors in informal caregivers of cancer patients during active treatment and follow‐up. Methods: This cross‐sectional descriptive study targeted primary caregivers of patients with different cancer diagnoses. Caregiver‐reported outcomes were measured by the Caregiver Risk Screen (CRS), Distress Thermometer (DT) and Caregiver Quality of Life Index—Cancer (CQOLC).