Below are the main rubriks (i.e strongest indications or symptoms) of Causticum in traditional homeopathic usage, not approved by the FDA.
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Manifests its action mainly in chronic rheumatic, arthritic and paralytic affections, indicated by the tearing, drawing pains in the muscular and fibrous tissues, with deformities about the joints; progressive loss of muscular strength, tendinous contractures. Broken down seniles. In catarrhal affections of the air passages, and seems to choose preferable dark-complexioned and rigid-fibered persons. Restlessness at night, with tearing pains in joints and bones, and faint-like sinking of strength. This weakness progresses until we have gradually appearing paralysis. Local paralysis, vocal cords, muscles of deglutition, of tongue, eyelids, face, bladder and extremities. Children are slow to walk. The skin of a Caucasian person is of a Dirty white sallow, with warts, especially on the face. Emaciation due to disease, worry, etc., and of long standing. Burning, rawness, and soreness are characteristic.