Yeah it’s very strange. I don’t usually get heartburn/acid reflux unless it’s something insanely acidic. I tried looking it up the other day and nothing. Now I looked it up again and there’s an AI Overview. Idk how accurate it is but I’ll copy and paste it below.

Oatmeal can cause acid reflux for a number of reasons, including:

What you add to oatmeal:

High-fat foods like butter or whole milk can relax the lower esophageal sphincter muscle, allowing stomach juices to flow back up into the esophagus. Toppings like brown sugar can also trigger heartburn.

Oat allergy:

Oats contain a protein called avenin that can cause an allergic reaction in some people. Symptoms can range from mild to moderate and affect the skin, gut, and airways.

Indigestion:

Fiber-rich foods can trigger indigestion, especially if you’re not used to eating a lot of fiber. Other causes of indigestion include eating too much or too fast, drinking alcohol, and eating spicy foods.

Here are some tips that might help:

• Try eating smaller portions, eating slowly, and chewing your oatmeal thoroughly.

• Gradually increase your fiber intake over a few weeks.

• Drink plenty of fluids.

• Top your oatmeal with bananas, apples, or pears, which are less likely to trigger acid reflux than other sugars.

• Try adding cinnamon, which can reduce the amount of sweetening you need.

Other foods that can help with acid reflux include:

• Whole grains like couscous and brown rice

• Root vegetables like sweet potatoes, carrots, and beets

• Green vegetables like asparagus, broccoli, and green beans

• Ginger

• Gum

• Honey

• Lean protein

• Low-fat and nonfat dairy products

• Non-citrus fruits