No, lactose intolerance is not in any way contagious. Lactose intolerance has to do with your body's inability to breakdown the proteins in milk. Because of this it is not contagious, as things that are contagious must be able to be passed from person to person and are typically viral or bacterial in nature.
Lactose intolerance can run in families. This means you could have a genetic predisposition towards the problem with proteins. You can also develop lactose intolerance later in life.As you age your body starts breaking down many things differently.
You can begin to be intolerant to lactose in one particular form or in all forms. Often times you can treat mild lactose intolerance with a pill such as Lactaid or drinking lower lactose milk available at most grocery stores.
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