Below are the main rubriks (i.e strongest indications or symptoms) of Natrum Phosphoricum in traditional homeopathic usage, not approved by the FDA.
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 ...