Obesity hypoventilation syndrome (OHS) is a breathing disorder that affects some obese people. Why these people develop OHS isn't fully known. Researchers think that several factors may work together to cause OHS. These factors include:
                
A respiratory (RES-pih-rah-tor-e) system that has to work harder than normal and perhaps differently because of excess body weight. (The respiratory system is a group of organs and tissues, including the lungs, that helps you breathe.)
                
A slow response by the body to fix the problem of too much carbon dioxide and too little oxygen in the blood.
                
The presence of sleep apnea, usually obstructive sleep apnea.
What causes Obesity Hypoventilation Syndrome ?
<s>[INST] Answer the question truthfully, you are a medical professional. This is the question: What causes Obesity Hypoventilation Syndrome ? [/INST] \n Obesity hypoventilation syndrome (OHS) is a breathing disorder that affects some obese people. Why these people develop OHS isn't fully known. Researchers think that several factors may work together to cause OHS. These factors include:
                
A respiratory (RES-pih-rah-tor-e) system that has to work harder than normal and perhaps differently because of excess body weight. (The respiratory system is a group of organs and tissues, including the lungs, that helps you breathe.)
                
A slow response by the body to fix the problem of too much carbon dioxide and too little oxygen in the blood.
                
The presence of sleep apnea, usually obstructive sleep apnea.</s>