People with physical-mental comorbidity have a poorer quality of life, worse clinical outcomes and increased mortality compared to people with physical conditions alone. South Asians (SAs) are the largest minority group in the UK and are more likely to have long-term conditions (LTCs) such as diabetes and heart disease. SAs are less likely to recognise symptoms which may represent mental health problems. To explore how people of SA origin with LTCs understand, experience and seek help for emotional distress, depression and anxiety. Systematic review of qualitative studies exploring emotional distress in SAs with diabetes or coronary heart disease, within primary and community care settings worldwide. Comprehensive searches of eight electronic databases from inception to 1st September 2021. Data extracted included study characteristics, and understanding, experience and help-seeking behaviour for emotional distress. Thematic synthesis was undertaken. The CASP checklist for qualitative studies was used to assess quality of papers, and GRADE-CERQual used to determine the overall strength of evidence. Twenty one studies from 3,165 unique citations were included. Three main themes were identified. Understanding of emotional distress: non-medical terminology used, such as ‘tension,’ and a complex relationship between emotional and physical illness. Experiences of emotional distress: multiple forms of inequality, distress at diagnosis of their LTC, cultural factors, and gender differences. Help-seeking behaviour: self-management, seeking help from family, friends, and faith, and inadequate clinical support. This review provides a greater understanding of SAs’ conceptualisation of emotional distress in the context of LTCs, to support improvement in its recognition and management.