Fennel has anti-spasmodic properties, which makes it a great reliever of pain induced from muscle contractions. Fennel tea is thus useful in managing muscle cramps, abdominal colic, and period pain. Fennel has high quantities of essential oils, which contain a lot of therapeutic properties. The antioxidants in fennel seeds also help in managing blood pressure, reducing cholesterol, increasing the red blood cell count, and boosting immunity in general. Regular consumption of tea steeped with fennel seeds can significantly improve your health.