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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RECTUM, ANUS, STOOL
Burning contracting pain in anus and lower rectum (on waking from troubled dream).
Sticking as from splinter in anus on walking.
Sore, raw feeling.
Itching soreness; must scratch.
Must bring will to bear to prevent escape of faeces.
Diarrhoea with colic; fears to pass flatus for fear faeces should escape.
After coitus (man) urging to stool and urination stools small, loose.
Yellowish green, so-called "hacked diarrhoea" (S).
Stool yellowish brown.; profuse, thin, yellowish brown.
Before stool Weak feeling in rectum and sphincter.
Small stool before breakfast, soft yet with effort; sudden urging while eating; afterwards, watery yellowish brown, painless stool.
Large, soft stool, easily expelled, with feeling afterwards as if much remained behind.
One day costive, next diarrhoea.
Intestinal, long or round worms, with acidity, picking nose, occasional squinting, pain in bowels, restless sleep (S).≡ more ...