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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Aching in shoulders.
Drawing and tearing (rheumatic) in shoulders, arms, and elbows, with lassitude in those parts.
Heaviness, rigidity, and pains in arms, which take away the power to lift them.
The r. arm and r. hand become numb and painful to move from pain in muscles.
Jerking and thrilling sensation in arms, hands, and fingers, esp. on grasping an object.
Drawing tension in forearms and hands.
Warts on arms.
Incisive pains in hands.
Tearing and boring in metacarpal bones, esp. in evening and morning in bed.
Burning in joints of hands in evening.
Swelling of hands (in afternoon).
Trembling of hands (morning).
(Hands become numb, painful, and prone to ulcerate)
R. T. C.).
Skin of hands dry, rough, and cracked.
Warts (or herpes) on the back of hands.
Red spots and tetters on hands.
Jerking in joints of fingers.
Distortion (contraction) of fingers.
Burning, itching, and burning blisters on fingers, as if stung by nettles.
Tension in bend of knee; the muscles are shortened.
Hollow of knees painful on motion.
Great heaviness in legs and feet, with stiffness when seated and when walking.
Jerking in thighs.
Tettery eruption on the buttocks.
Contraction of tendons of ham.
Tetters on ham.
Pressive and cramp-like drawing in legs.
Cramp and pulling in calves of legs, as if too short.
Legs swollen, red, inflamed, and covered with ulcers.
Blotches (as in lepra) on legs.
Incisive pains and cramps in feet.
Burning in joints of foot in evening.
Swelling of feet, or soles of the feet, with shootings, when planting foot on the ground.
Tendency to dislocate and sprain joint of foot.
The ankle is so weak that it gives way; the foot bends under when stepping on it.
Coldness of feet.
Chronic ulcers in heel, proceeding from gnawing vesicles.
Black, ulcerated pustule on heel.
Throbbing and crawling in both heels.
Cracks and excoriation between toes.
Swelling of (big) toes, with tearing, and pain as from excoriation, which banishes sleep.
Blisters on extremity of the toes, as from a burn.
Boring, drawing, and shooting in corns.≡ more ...