{Reference Type}: Journal Article {Title}: The assessment and management of obstructive sleep apnoea-hypopnoea syndrome and obesity hypoventilation syndrome in obesity. {Author}: Young R;Benjamin A; {Journal}: Clin Med (Lond) {Volume}: 23 {Issue}: 4 {Year}: 2023 Jul {Factor}: 5.41 {DOI}: 10.7861/clinmed.2023-0151 {Abstract}: Obesity is associated with respiratory dysfunction. It is a key risk and contributory factor in the sleep related breathing disorders, obstructive sleep apnoea/hypopnoea syndrome (OSAHS) and obesity hypoventilation syndrome (OHS). Weight management is an integral part of the management of these disorders, in addition to continuous positive airways pressure (CPAP) and non-invasive ventilation (NIV). Untreated, these conditions are associated with a high disease burden and as treatment is effective, early recognition and referral is critical. Best practice in on-going care is multidisciplinary.