This point is made crystal clear even when we take a look back over the last few years. According to the National Sleep Foundation (NSF), a U.S. nonprofit organization of researchers, patients and health-care facilities, 20% of Americans reported getting six hours of sleep or less in 2009, compared to 13% in 2001.
An ulcer (/ËÊlsÉr/; from Latin ulcus, ulcer, sore) is a break in the skin or mucous membrane with loss of surface tissue and the disintegration and necrosis of epithelial tissue. A mucosal ulcer is an ulcer which specifically occurs on a mucous membrane.
Definition & Facts. 1  A peptic ulcer (stomach ulcer) is a sore on the lining of your stomach or duodenum. 2  A dull or burning pain in the stomach is the most common symptom of peptic ulcers (stomach ulcers). 3  Peptic Ulcers (stomach ulcers) have different symptoms and causes, but only endoscopy or an x-ray can determine if you have one.