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Heartburn, constipation, and vomiting are potential side effects of feverfew. Canker sores and irritation of the mouth are more likely to occur if you chew the feverfew leaves, instead of taking the tablets or capsules. There are also a number of feverfew side effects that require immediate medical attention, such as contractions of the uterus during pregnancy or signs of an allergic reaction.

Does Feverfew Cause Side Effects?

As with any medication or supplement, side effects are possible with feverfew. Interestingly, feverfew may cause different side effects, depending on whether it is taken as a capsule or tablet, or whether the leaves are eaten straight from the plant.

Possible Feverfew Side Effects

Possible bothersome (although not usually serious) feverfew side effects may include:
  • Canker sores
  • Irritation of the lips and tongue
  • Loss of taste
  • Nausea or vomiting
  • Constipation
  • Diarrhea
  • Heartburn or indigestion
  • Weight gain
  • Menstrual changes.
Chewing the leaves, instead of taking feverfew tablets or capsules, is probably more likely to cause canker sores and irritation of the mouth. There have been reports of side effects occurring when people stopped taking feverfew, especially if they took the herb for a long period of time. Such withdrawal effects may include:
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Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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