Do lots of people get obstructive sleep apnea, or is it unusual?

Lots of people do. 24% of men and 9% of women 30-60 years of age in the USA will qualify for OSA if allcomers are studied by an overnight sleep study. If only people who complain of daytime sleepiness are included, then the number drops precipitously to: 4% of men and 2% of women. Still, a pretty high prevalence, isn't it?
Obstract sleep apnea. It may affect 10% of the population, tends to occur between the ages of 40 and 60, and affects more males than females. Two-thirds of patients with OSA are overweight and fatty infiltration of the neck and tongue may also contribute to airway obstruction during sleep. Interestingly, most patients with OSA are not aware of the problem despite being exhausted on awakening.
Much more common. Sleep apnea seems to be a lot more prevalent now due to environmental polliutants, poor nutrition, and other variables.
Very common. I see it very often in my oral surgery practice. Has an impact on safely sedating orals surgery patients.

Related Questions

Do a lot of people get obstructive sleep apnea?

Yes. About 1-5% of us population has sleep apnea and the trend is increasing with increase weight gain in last 1-2 decade. Neck size greater than 17 inch in male and 16 inch in females with history of snoring, sleep symptoms like fatigue, daytime sleepiness, and high blood pressure are some of the screening sign/symptoms one may want to consider for evaluation of sleep apnea. Read more...
Yes. It has been published that 2% of women and 4% of men. But in my experience, i believe it is much higher. Read more...
Many more. Many more than you would think. Read this for details: http://healthysleep.med.harvard.edu/sleep-apnea/living-with-osa/health-consequences. Read more...

I have obstructive sleep apnea after gaining weight from steroids. Lately I drool a lot and sometimes foam at the mouth. Why?

See your provider. You can get a referral to a sleep specialist or perhaps your PCP can help you with all of these including ways to get the weight down. It's possible to stop the problem - then you can ask them why. Best! Read more...
See a specialist. Treating obstructive sleep apnea is a life and death decision! Sleep and oxygen deprivation can trigger severe health problems and decrease quality of life due to Obstructive Sleep Apnea. See a sleep specialist for PSG study and proper treatment. Do not procrastinate. Read more...