* Lactose Intolerance: This is the most common, caused by the inability to digest lactose, a sugar found in dairy.
* Dairy Allergy: This is an immune system reaction to proteins in dairy, like casein or whey.
* Dairy Sensitivity: This is a broader term that can encompass lactose intolerance, dairy allergy, or other reactions to dairy. It can involve symptoms like bloating, diarrhea, gas, or skin problems.
* Vegan: This is a dietary choice to exclude all animal products, including dairy.
So, the term you use depends on the specific reason for avoiding dairy.