Feverfew is safe and will not have any side effects for most people when used in the short term (four months). The study tested show that feverfew side effects include stomach upset, heartburn, diarrhea, constipation, bloating, flatulence, nausea, vomiting, etc. Other reported side effects include: tension, dizziness, headache, insomnia, stiff joints, fatigue, menstrual changes, rash, heavy heartbeat, weight gain.
There is no more than four months' use of feverfew safety studies.
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