Introduction
Obstructive sleep apnea (OSA) is one of the diseases of the 21st century. Clinical studies have shown that untreated OSA significantly impacts individual's overall health, safety, and quality of life. Sleep apnea accounts for repetitive cessations of breathing during sleep. The consequences include and are not limited to low blood oxygenation levels and impaired sleep quality and quantity. In the long-term, the mentioned abnormalities increase the risk of cardiovascular and brain accidents, metabolic, vestibular, visual and central-brain disorders.

The aim of the present clinical study was to investigate the relationship between OSA, multiple comorbidities and level of deterioration of the quality of life in patients.

Material and methods
For the purpose of the study, an epidemiological survey of 100 patients, diagnosed with OSA was conducted – a completion of sleep questionnaires and a thorough clinical examination (ENT and dental) were executed. Hearing and balance capabilities were assessed. Occlusion was studied. All patients completed medical history files with information for general diseases and medications intake. Written informed consent forms were signed by all participants. Approval from Medical University - Varna Ethic committee was received.

Results
The results from the present study confirm that untreated obstructive sleep apnea leads to long term consequences on general health, multiple comorbidities, severely affecting the quality of life.

Conclusion
OSA occurs in both adults and children. Timely detection, follow up and treatment prevents significant health problems for the individual. The comorbidity of OSA leads to high risk of deteriorating general health and well-being and reducing the quality of life of an individual.

The authors declare that there is no conflict of interest.