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Spigelia marilandica (pinkroot)
Spigelia is a great remedy for left-sided headaches when the headache starts in the neck and then radiates to the front of the head, finally stopping above the left eye (compare sanguinaria for headaches above the right eye and Silicea for heaches above both eyes). Spigelia is also one of the best remedies for a very painful condition called trigeminal neuralgia on the left side of the face (although this too should be under the care of a professional).