Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Sulphuricum in traditional homeopathic usage, not approved by the FDA.
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BACK AND NECK
Back and neck
Contusive pains in sacrum, or pain as from ulceration, esp. at night.
Lancinations in loins, when seated.
Tearing and gnawing pains along spine.
Incisive shootings between the shoulder-blades.
Lancinations in axillae. 21. Limbs.
Painful sensibility of limbs, which feel as if bruised, or fatigued.
Prostration; tired, weary, esp. knees.
Attacks come on suddenly.
Stitches in nape of neck at night.
Jerking tearings and tension in muscles, on l. side of neck.
Soreness up and down spine and neck.≡ more ...