Are there different types of IBS?
Yes. The type of irritable bowel syndrome you have is identified by your predominant symptoms. Most people have the alternating type. If you have this type, you alternate between episodes of diarrhea and constipation. Approximately 30 percent of people with IBS have the diarrhea-predominant type, according to the International Foundation for Functional Gastrointestinal Disorders. This type is characterized by abrupt episodes of diarrhea upon waking, or during or immediately after eating. Approximately 20 percent of people with IBS have the constipation-predominant type. This occurs when periodic constipation and pain in the lower abdomen are the primary symptoms. Eating often triggers these symptoms.

What are the most common symptoms of IBS?
Abdominal pain that occurs with diarrhea, constipation or both is the most common symptom of irritable bowel syndrome. The pain occurs in episodes, not continually, and is often relieved with a bowel movement. Individuals with IBS may also experience the sensation of incomplete defecation after a bowel movement. Other symptoms of IBS include cramping, bloating, gas, heartburn, nausea and difficulty swallowing. Symptoms of this chronic condition can recur throughout life.

Do the symptoms of IBS wake you up at night?
Not usually. Symptoms of irritable bowel syndrome almost always occur while you are awake. It is rare for symptoms such as diarrhea or abdominal pain to wake women with IBS from sleep. When such symptoms do rouse you, they may indicate the presence of other medical problems.