Ingredients and Uses

10 Serious Side Effects Of Fennel Seeds

10 Serious Side Effects Of Fennel Seeds May 17, 2019

Fennel is a pleasant smelling herb which bears yellow coloured flowers. It is a perennial plant and is used to cure various digestive and respiratory problems. Now I know you are confused. Why I am talking about the benefits of fennel seeds when the title speaks of their side effects? It is to remind you that because fennel treats a few ailments, it doesn’t mean you can take it for granted.

Because it has some very serious side effects which you have to consider.

Fennel Seeds Side Effects

Check out some of the serious side effects of fennel seeds.

1. Causes Photodermatitis


The name might sound new to you, but not the symptoms. Ever had the bitter experience of developing rashes when you were exposed to sunlight? Then chances are that you had consumed fennel seeds. (1)

Other symptoms of photodermatitis include pain and redness, and in some extreme cases even chills, fever and headache.

2. Drug Interferences

‘Don’t interfere with others’ businesses’ – One of the many important adages we have been coming across since childhood. And it looks like fennel seeds sometimes end up doing the exact opposite.

In case someone you know is under medication for seizure disorders or epilepsy, then fennel seeds are a BIG NO for them. The seeds interact with the functioning of the drug and might aggravate the situation. (2)

3. Causes Thelarche

Thelarche is a condition which marks the starting of breast development in women at the beginning of puberty. And fennel tea is one of the leading causes of thelarche. (3)

4. Causes Contact Dermatitis

Contact dermatitis is another type of skin condition whose symptoms include skin inflammation and an outburst of blisters. Fennel seed oil is known to cause contact dermatitis and other cross reactions. (4)

5. Allergy

Fennel seeds are notorious for causing allergies. Mostly people with pre-existing allergies are vulnerable to the allergies caused by fennel. (5) Abdominal cramps and wheezing are the other symptoms of allergic reactions.

[ Read: Home Remedies To Treat Skin Allergies ]

6. Might Cause Breast Cancer

There hasn’t been any evidence which holds fennel seeds responsible for the cause of breast cancer. However, there have been reports which suggest the usage of fennel for increasing breast milk production; where fennel was found to act directly on breast tissue. (6)

7. As A Uterus Stimulant

One of the talked about fennel seeds side effects is that it stimulate uterus. Yes, fennel seeds should not be consumed by pregnant women as the seeds have a tendency to stimulate the uterus. (7)

8. Inhibits Enzyme

A constituent of fennel seeds is known for inhibiting a drug metabolizing enzyme called cytochrome P450 3A4. (8) Hence, any medications which are metabolized by these enzymes are vulnerable to fennel seeds; and not consuming them while under such medication is the best option.

9. Harmful For Lactating Women

Fennel seeds can pose serious health threats to lactating women. So it is advisable for lactating women to limit the consumption of fennel in any form. (9)

[ Read: Powerful Fennel Tea Benefits ]

10. Other Toxicities

Fennel seed oil was found to be detrimental to DNA. Also, a constituent of fennel called estragole, was found to cause tumours in animals. (10) So in case you or anyone around you is suffering from any kind of hormone sensitive disease like cancer, strict medical advice is mandatory before consuming fennel.

There is a saying which has stood strong since ages – too much of anything can be poisonous. The same applies to fennel seeds too. Though the seeds do have certain health benefits, it is wise to reduce their consumption taking into consideration the host of health risks they possess.

Hope you liked our post on fennel seeds side effects.So, its better to be on the safe side before you consume fennel seeds in excess. Because health is very important, right?

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