Objective: To measure the psychological distress among the informal caregivers of disabled young adults with traumatic brain injuries (TBI) and to identify its associated factors.; Methods: An analytical cross sectional study was conducted with 76 informal caregivers of young adults (19 - 50 years) with TBI, using admission records of one of the tertiary care hospitals in Karachi, Pakistan from 2015 to 2016. Data were collected using a structured questionnaire comprising a general demographic questionnaire and the General Health Questionnaire- 28. The effect of the predictors on the psychological distress was determined by applying multiple linear regression analysis.; Results: The mean score of the psychological distress was found to be 23.5±14.28. The findings indicated that anxiety and insomnia, and social dysfunction were the most affected domains of psychological distress; whereas, depression was the least affected. Factors including the management of finances, number of children, patient's gender, and patient's level of disability and lack of socialization were positively associated with the level of distress. As reported by participants, religious beliefs served as a coping mechanism for most of them.; Conclusions: The study showed a high level of distress among informal caregivers of young adults with TBI. For recognizing the psychological effects of TBI in patients and their informal caregivers, it is important to initiate and ensure the provision of psychological support to the patients and their families.