The enzyme that breaks down lactose is called lactase. When the intestine does not contain lactase, then lactose intolerance can occur. It is a troublesome and annoying problem, but it is never a serious one. As commonly expected, infants and small children have the enzyme lactase so they can digest mothers' milk. However, during childhood, lactase begins to disappear in many people.
Some ethnic groups are more likely to develop lactose intolerance.
The amount of hydrogen released after a lactose meal can indicate a problem. Under IV conscious sedation, a specialized endoscope is inserted into the mouth,esophagus and stomach. This type of scope is connected to an ultrasound machine. The motility study is done with a balloon catheter, connected to a computer. It indicates the strength of the anal sphincter and is usually done on children with constipation problems.