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Research in this area is lacking, so scientists need to conduct more research to investigate the potential side effects of mugwort in a variety of forms and uses.
That said, mugwort can cause allergic reactions similar to those associated with ragweed. These reactions can occur from coming into physical contact with the plant or from drinking tea made from the herb.
Symptoms of such allergies can include:
- • sneezing
- • a runny nose
- • nasal congestion
- • headaches
- • irritated eyes
- • itchy throat
As well as these effects, mugwort can also increase asthma symptoms, such as coughing and wheezing.
There is also something called “birch-mugwort-celery syndrome,” or “celery-carrot-mugwort-spice syndrome,” which indicates that if a person is allergic to one of the substances in these names, they may also be likely to be allergic to the others. This is also known as oral allergy syndrome.
Also, mugwort contains a substance called thujone, which can be toxic in large amounts. The amount present in the herb itself is little enough that experts generally consider it safe to use.
However, if a person chooses to use mugwort in the form of oil, they should be aware of this potential risk, as it is the oil that contains this substance. This means that there will be a high concentration of it.
Historically, experts have associated this herb with pregnancy loss, so many recommend that pregnant people avoid mugwort so as to minimize the risk of miscarriage.
Also, one 2020 study found significant toxic components in moxibustion smoke that might have negative effects on the liver, kidneys, and heart. Therefore, people should ventilate extensively when using mugwort. *