Common food allergens and sensitivities include:

Dairy: Some people are sensitive to lactose, a sugar found in milk and other dairy products. Others may be allergic to the proteins found in milk.
Gluten: Gluten is a protein found in wheat, barley, and rye. Some people may be sensitive to it, leading to symptoms like bloating, diarrhea, and abdominal pain. Others may have celiac disease, an autoimmune disorder that causes damage to the small intestine when gluten is consumed.
Soy: Soy is a common allergen, particularly in children. It can cause symptoms like hives, swelling, and difficulty breathing.
Nuts: Nuts, including peanuts, tree nuts, and seeds, are common allergens that can cause severe allergic reactions, including anaphylaxis.
Shellfish: Shellfish, including shrimp, crab, and lobster, can cause severe allergic reactions in some people.
Eggs: Some people are allergic to the proteins found in eggs, leading to symptoms like hives, swelling, and difficulty breathing.
Fish: Fish allergies are less common than other food allergies, but can be severe.
Corn: Some people may have a sensitivity to corn, which can cause symptoms like digestive upset and skin rashes.

It's important to note that food allergies and sensitivities can vary widely from person to person, and some people may be sensitive to multiple foods or have allergies to foods not listed above. If you suspect you may have a food allergy or sensitivity, it's important to speak with a healthcare provider to determine the best course of action.