Side Effects of Ground Flaxseed

Ground flaxseed, containing flaxseed oil, is an excellent source of omega-3 fatty acids and is a common dietary supplement. Ground flaxseed spoils when exposed to heat and light, so refrigeration is recommended. According to Carie E. Shealy, of the University of Colorado Denver School of Pharmacy, some medical benefits exist when flaxseed is used in arthritis, cancer and lupus treatment. However, flaxseed use may result in gastrointestinal side effects and may harm some individuals.

Ground Flaxseed Indigestion

• Ground flaxseed causes indigestion in some users. A University of Wisconsin School of Health and Public Medicine patient handout recommends several small doses rather than one large dose of flaxseed as flax oil can cause indigestion or a bloated feeling. Some people experience stomach cramping and some have minor stomach pain with ground flaxseed use. The feeling of indigestion is most common in those just beginning flaxseed omega-3 dietary supplementation.

Ground Flaxseed Laxative Effects

• Ground flaxseed is high in fiber. Shealy reports that flaxseed increased laxation in several lupus patients but that limited test data is available on the effect of flaxseed on constipation. Many people just starting an omega-3 flax oil supplement such as ground flaxseed will experience laxative effects unless high fiber content is previously included in the diet. Large doses of ground flaxseed in those unaccustomed to flax oil may produce undesired laxative effects.

Potential Serious Side Effects

• Ground flaxseed omega-3 dietary supplements may have serious side effects in some people with preexisting bleeding disorders, Shealy warns. Excessive amounts of flaxseed may cause thyroid problems, but no studies link proper flaxseed doses to thyroid problems. The common ground flaxseed omega-3 supplement dose is 1 to 2 tablespoons per day.