Dikmen, Nursel2024-09-192024-09-192023979-888697891-9979-888697858-2https://hdl.handle.net/20.500.12483/14491Obstructive sleep apnea syndrome (OSAS) is a syndrome characterized by recurrent episodes of upper airway obstruction during sleep and often progresses with a decrease in blood oxygen saturation. OSAS patients have high mortality and morbidity rates. Asthma, on the other hand, is a heterogeneous disease, usually characterized by chronic airway inflammation, causing bronchial obstruction and secondary respiratory symptoms such as cough, shortness of breath, and wheezing, especially in the form of nocturnal attacks. The co-occurrence of obstructive sleep apnea-hypopnea syndrome (OSAS) and lung diseases such as chronic obstructive pulmonary disease (COPD), asthma, interstitial lung disease (ILD), and cystic fibrosis is called overlap syndrome. In this section, the co-existence of OSAS and asthma was considered an overlap syndrome. Recent data have shown that the presence of OSAS in asthma patients makes it difficult for patients to control their symptoms. Again, some studies have found an increased prevalence of OSAS in asthma patients. This section summarizes OSAS asthma overlap syndrome and treatment modalities considering the current literature. © 2023 Nova Science Publishers, Inc.eninfo:eu-repo/semantics/closedAccessAsthmaChronic inflammationContinuous positive airway pressure (CPAP)Obstructive sleep apnea syndromeOverlap syndromeBook Chapter67762-s2.0-85167861280N/A