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
Crick in both sides of neck,
Weakness in back (sixtieth and one hundred and fifty-fifth days); towards evening (one hundred and fortieth day),
Weakness in back, requiring an effort to sit erect (one hundred and thirty-seventh day); back weak, worse towards evening (one hundred and thirty-eighth day),
Stitches to right of spine, on taking deep breath, morning,
Slight pain in left scapula, in evening (one hundred and twenty-seventh day),
Weak feeling in small of back, when lying in bed, at 11 P.M.; most felt when lying on back, but not relieved by lying on side; diminishes in a few minutes, and is followed by an annoying, deepseated twitching in left inguinal region,
Shooting in region of right kidney (one hundred and fifty-fifth day),
Fine stitching pains in left renal region,
Pain in articulation of lumbar vertebra and sacrum, left side; pressing the spot causes a pain down thigh to knee, ; later, this spot grew more painful, and the leg seemed to give was when walking, as though knee was weak,
Sharp cutting in right sacro-iliac articulation (one hundred and thirty-sixth day),≡ more ...