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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BACK AND NECK
Back and neck
Pains in the loins which render the least movement exceedingly painful.
Aching pains in the loins when seated.
Painful stiffness (between the scapulae and) in the back, esp. on rising from a chair.
Pulling and acute drawing pains in the shoulder-blades.
Itching and tingling in the back.
Stiffness and tension in the nape of the neck.
Pain, as from a bruise in the nape of the neck.
Miliary eruption at the nape of the neck, between the shoulder-blades.
Itching and humid tetters at the nape of the neck.
Goitre-like swelling of the cervical glands.≡ more ...