Intolerances refer to adverse reactions that occur when the body has difficulty digesting certain substances, often food. Unlike allergies, which involve the immune system, intolerances typically result from a lack of specific enzymes needed to break down certain components, such as lactose in dairy products or gluten in wheat. Symptoms can include bloating, gas, and stomach pain. Common types of intolerances include lactose intolerance, where individuals cannot properly digest lactose, and gluten intolerance, which can lead to discomfort after consuming gluten-containing foods. Managing intolerances often involves avoiding trigger foods and finding suitable alternatives to maintain a balanced diet.