Lovage has been used through history for many ailments, but today it is mostly prescribed for stomach problems, kidney problems, and headaches.  Chewing on the dried root supposedly keeps one alert.  It appears that Lovage does contain diuretic properties (mostly in the root), and has been observed to work well as an anti-flatulence agent and for colic in children.  Make a Tea for any of the above problems, and see how it works.

Externally, Lovage has been used in bath water to relieve skin irritations.  Put a handful in a mesh bag under the tap when running the bath water.  The fresh juice from the leaves and stems squeezed into the eye is also said to cure pinkeye.