Onion intolerance involves the digestive system’s inability to effectively process onions, resulting in discomfort and a range of symptoms. This is a non-immune response, in contrast to an onion allergy, which is an immune reaction to proteins in onions. Allergic reactions can include severe symptoms like hives, swelling, or anaphylaxis. In comparison, onion intolerance generally leads to milder, primarily digestive-focused symptoms and does not involve the immune system.

• Bloating and gas
• Abdominal pain
• Diarrhea
• Nausea
• Indigestion
• Headaches

If you regularly experience digestive discomfort such as bloating, abdominal pain, or diarrhea after eating onions, it might be advisable to consider a test for onion intolerance. This is particularly important if these symptoms disrupt your daily activities or if the specific cause of your discomfort is unclear, as it could be a sign of other dietary sensitivities or health issues.

Managing onion intolerance involves avoiding or limiting onions in your diet. Since onions are a common ingredient in many dishes and cuisines, careful examination of food ingredients and menus is essential. Seek alternative flavorings and ingredients that do not cause discomfort. For nutrients typically found in onions, like vitamins and antioxidants, include other vegetable sources in your diet. Consulting with a dietitian can provide guidance on maintaining a balanced diet while avoiding onions. Keeping a food diary can also be helpful in identifying other potential food intolerances and in tracking dietary adjustments.