Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Phosphoricum in traditional homeopathic usage, not approved by the FDA.
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BACK AND NECK
Back and neck
Scrofulous swelling of lymphatic glands (S).
Weakness in back towards evening.
Slight pain in l. scapula.
Sharp pain in r. sacro-iliac joint. 21. Limbs.
R. wrist and l. ankle weak, ache as if paralysed (after menses).
Drawing in hands, feet, wrist-joints, and l. shoulder.
Crick in both sides of neck.≡ more ...