Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Carbonicum in traditional homeopathic usage, not approved by the FDA.
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Great weakness of limbs, especially in morning
Easy dislocation and spraining of ankles
Foot bends under ( Causticum Caust.) Soreness between toes and fingers
Heel and tendo-achilles affected
The hollow of the knee is painful on motion
Icy cold up to knees.≡ more ...