Flaxseed oil capsules are one type of omega-3 fatty acid supplement taken for many conditions. Acid reflux has been reported as a side effect when taking a fish oil omega-3 fatty acid supplement; however, acid reflux is not a common reported side effect with flaxseed oil capsules.

Acid Refux

Acid reflux, also known as gastroesophageal reflux disease (GERD), is a condition in which food or liquids from the stomach or small intestine leak back into the esophagus, the tube from the mouth to the stomach. Acid reflux causes heartburn, a burning pain in the chest and other symptoms that may include nausea, difficulty swallowing and a feeling of food stuck in the chest.

Flaxseed Oil

Flaxseed oil capsules are omega-3 fatty acid supplements that contain the polyunsaturated acid alpha-linoleic acid. This type of fatty acid is thought to decrease inflammation, and flaxseed oil capsules are currently taken for many conditions, which include osteoarthritis, heart disease, anxiety, diabetes, breast cancer, constipation and high cholesterol.

Flaxseed Oil Safety

Flaxseed oil capsules are rated as likely safe for most adults when used appropriately on a short-term basis. The most common reported side effects with taking flaxseed oil capsules or other omega-3 fatty acid supplements is gastrointestinal discomfort, which may include mild cramps, flatulence and diarrhea. Acid reflux has been reported as a side effect after taking an omega-3 fatty acid supplement; however, this side effect is mainly associated with a fish oil supplement. Flaxseed oil capsules may actually be recommended as a substitute for fish oil supplements in an effort to reduce acid reflux.

Avoiding Acid Reflux

Additional precautions that can be taken to avoid acid reflux and heartburn include taking the capsule with food; avoiding foods that may trigger the condition, which may include alcohol, caffeine, citrus, tomatoes and chocolate; avoiding lying down with a full stomach; eating smaller meals; and reducing stress.