Which of the following is an adverse effect of CPAP therapy?

Sore throat is considered an adverse effect of CPAP therapy. This discomfort often arises due to airflow delivered by the CPAP machine, particularly if the patient is not accustomed to the constant airflow or if the air pressure settings are too high. The dry air produced can irritate the throat, leading to soreness or dryness, especially if the humidification settings are inadequate or if the device is used without a heated humidifier.

While water retention, regular coughing, and excessive sweating can occur for various reasons, they are not typically classified as direct adverse effects of CPAP therapy. For example, water retention may be related to other underlying health conditions rather than the CPAP itself. Regular coughing could stem from multiple causes, such as an upper respiratory infection or allergies, rather than the CPAP use. Excessive sweating may also occur due to other factors, including stress or environmental conditions, rather than being a common result of CPAP therapy.