Below are the main rubriks (i.e strongest indications or symptoms) of Ferrum Met in traditional homeopathic usage, not approved by the FDA.
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Painfulness of left external ear, as if there were an ulcer on it (after twelve hours),
Stitches in right ear, in the morning (after twelve hours),
Humming in ears, which, as well as the disagreeable feeling in the brain, is relieved by laying the head upon the table,
Ringing in the right ear,
Chirping before the ears like crickets,≡ more ...