Venous reflux disease (VRD) occurs when veins do not properly return blood to the heart. Health experts refer to it as chronic venous insufficiency (CVI). VRD most commonly affects the legs and ...

But if allergies, asthma, sleep apnea, or gastroesophageal reflux (GERD ... This advice applies whether or not you use a CPAP machine. (CPAP stands for continuous positive airway pressure.) ...