Common symptoms of flax seed allergy are itching, nausea and vomiting, reports Mayo Clinic. Shortness of breath is possible and, in extreme cases, flax seed could cause anaphylaxis.
Itchy hands and eyes, hives, and watery eyes and nose are mild allergic reactions to flax seed according to Mayo Clinic. Digestive problems, such as nausea and vomiting, are also possible as well as extreme reactions like anaphylactic shock.
There is some evidence that flax seed causes dips in blood sugar meaning that individuals with diabetes should regulate intake of flax seed. There is a possibility that flax seed heightens the risk of bleeding and it might lower blood pressure. It is best to consult a doctor if there are plans to take flax seed oil along with other medication or before surgery. Flax seed possibly causes blockage of the intestines if ingested in large amounts or ingested with inadequate liquid intake. Because of the alpha-linolenic acid content of flax seed, there is a tenuous link between flax seed consumption and increased risk of prostate cancer, says WebMD. However, current studies disagree on the role of alpha-linolenic acid in prostate cancer.
Only mature flax seeds are recommendable for consumption, says Mayo Clinic. Some evidence exists of toxicity in unripe or immature flax seed pods.