The difference between milk allergy and food intolerance is: 1. Mechanism: milk allergy is mediated by immunoglobulin IgE antibodies, while food intolerance is mediated by immunoglobulin lgG antibodies. 2. Etiology: milk allergy is related to genetics, age, and environmental factors; food intolerance is related to freshness of food, duration of time, or lack of certain enzymes. 3. Chronic attacks of food intolerance often occur only a few days after eating intolerant food, manifesting as skin mucosa, intestinal symptoms, headache, hypertension, hyperlipidemia, gout, etc.; 4. Avoidance of allergic foods can relieve symptoms; food intolerance can be consumed in small amounts, intermittently or in rotation with similar foods.