What are the sypmtoms for it? How do you make it better? Does all dairy do it?
Most people loose the ability to digest milk sugar (lactose) after early childhood. Most people of European ancestory can digest lactose as adults while most people of Asian or African descent and indiginous Americans can't.
Most people who are lactose intollerant can consume small amounts of milk without problem. If they consume too much they may experience gastro-intestian problems like excessive, gas, bloating, diarhea and abdominal discomfort.
In some dairy products much of the lactose is already converted to more digestable sugars. Yogurt cultures produce lactase (the enzyme that breaks down lactose) so it is usually less problematic than milk. Cheeses usually only have a fraction of the lactose found in milk and aged cheeses contain almost none. Acidophilus milk is available that has a bacteria added to break down lactose. Of course soy, rice, oat, and nut milks naturally contain no lactose at all.
lactose intolerance is a condition some people have because there is a special sugar in milk or whatever called lactose and if the person drinks it their body can't digest that certain sugar so they start to get certain reactions