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7 side effects of eating too many flaxseeds

Flaxseeds have benefits, including better digestion and weight loss. But check out the side effects of flaxseeds before consuming the healthy seeds.
Written by: Aayushi Gupta
Updated On: 12 Jun 2025, 11:55 am IST
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Flaxseeds may harm your body. Image courtesy: Adobe Stock

Eating flaxseeds to relieve constipation or lose weight? Consuming the tiny healthy seeds can do more harm than good, as there are potential side effects of flaxseeds. The plant-based superfood, available in golden-yellow and reddish-brown colours, is used in Ayurvedic medicine. The seeds offer healthy fats, vitamins, omega-3 fatty acids, and fibre that are all needed by your body. Also, these seeds are rich in lignans, and have both estrogen and antioxidant properties. Common side effects of flaxseeds include constipation, allergic reactions and bleeding disorders. But the list is longer than you think.

What are the benefits of flaxseeds?

Flaxseeds are small seeds that are good for health. Here are some of the benefits of flaxseeds:

  • Good for the heart: They are a rich source of nutrition, as they contain omega-3 fatty acids. These, especially eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), can help lower triglycerides, increase high-density lipoprotein or good cholesterol, and lower blood pressure. These support heart health.
  • Improves digestion: They improve digestion, as they consist of fibe. Soluble fibre absorbs water, which helps to soften stools and make it easier to poop. This something beneficial for people struggling with constipation. Insoluble fibre adds bulk to the poop, which also helps with regular bowel movements.
  • Helps with weight loss: Fibre not only supports digestive health, but also helps with weight loss.

Check out the ways to include flaxseeds for weight loss in your diet.

Flaxseeds
There are many flaxseed benefits, but don’t consume these in excess. Image courtesy: Pexels

What are the side effects of flaxseeds?

Here are some of the side effects of flaxseeds:

1. May cause allergic reactions

One of the biggest side effects of flaxseeds is that there is a high chance you may have an allergy to flaxseeds and flaxseeds oil. You should stop consuming these seeds, if you notice any itching, swelling, redness, or hives. Vomiting and nausea could also be an indicator of an allergy. Those who consume flaxseeds frequently are more likely to develop allergic reactions. While this allergy is rare, a study published in the Journal of Allergy and Clinical Immunology, recounts an incident where an 11-month-old infant developed severe anaphylaxis after ingesting flaxseed.

2. Might worsen inflammation in the body

One of the benefits and side effects of flaxseeds is that they contain inflammation-reducing omega-3 fatty acids. So while that can help you, it can also create an issue. According to a study published by the Advances in Nutrition, flaxseeds can prove to be problematic. Yes, if consumed in large amounts, it could exacerbate inflammation in the body. 

3. Beware if you’re trying to conceive

Flaxseeds often act like estrogen, and that means it could hamper the hormonal balance in your body. In certain cases, it could also lead to changes in the menstrual cycle. There are some women, who also experience other hormonal issues like PCOS (polycystic ovary syndrome), uterine fibroids, uterine cancer, and ovarian diseases. This is one of the biggest side effects of flaxseeds that one needs to be aware of. 

4. Unsafe during pregnancy and lactation

Due to their striking similarity with estrogen, flaxseeds may be harmful for pregnant women. Therefore, it is advised to consume flaxseeds, only if your doctor deems it fit. The National Centre for Complementary and Integrative Health states that one of the most harmful side effects of flaxseeds is that they have a mild hormonal effect. However, more research is needed. 

5. May induce loose stools

Loose motions as well as an upset stomach are the other side effects of flaxseeds that cannot be missed, states the National Centre for Complementary and Integrative Health. Flaxseeds are rich in dietary fibre, but a sudden increase in consumption can increase the number of bowel movements. You may also experience stomach ache, diarrhea, constipation, and bloating. 

6. It may lead to Intestinal blockage

Flaxseeds should ideally be had with water or any other fluid, but if you consume them without enough liquid, you could end up with intestinal blockage and obstructions. It is particularly dangerous for patients with scleroderma because flaxseeds can cause severe constipation and blockage. So, don’t consume them unless your doctor gives you a go-ahead!

A spoon of flaxseeds
Flaxseeds should not be consumed by pregnant women. Image courtesy: Adobe Stock

7. May react with medications

Because flaxseeds are high in fibre, they contribute to intestinal blockage and constipation. In this condition, the absorption of certain medications and supplements gets inhibited. It is best to avoid it, especially when you’re on oral medication to reduce blood sugar levels.

Make sure to keep these side effects of flaxseeds in mind while consuming these tiny nutritional powerhouses.

Related FAQs

Who should not eat flax seeds?

People with a bowel obstruction, an inflamed bowel as well as esophagus should stay away from flax seeds.

How much flaxseed can be had every day?

While there is no fixed dosage of flaxseed that can be had everyday, about 1-2 tablespoons are safe to eat per day.

Disclaimer: At Health Shots, we are committed to providing accurate, reliable, and authentic information to support your health and well-being. However, the content on this website is intended solely for informational purposes and should not be considered a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider for personalised advice regarding your specific medical condition or concerns.

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About The Author
Aayushi Gupta
Aayushi Gupta

Aayushi Gupta is a health writer with a special interest in trends related to diet, fitness, beauty and intimate health. With around 2 years of experience in the wellness industry, she is connected to leading experts and doctors to provide our readers with factually correct information.

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