Below are the main rubriks (i.e strongest indications or symptoms) of Acid Phos in traditional homeopathic usage, not approved by the FDA.
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BACK AND NECK
Back and neck
Formication in the back.
Gnawing on the scapulae.
Heaviness in lumbar region, increases to pain in the legs. θ Tabes dorsalis.
Burning pain in a spot about small of back.
Burning in lower half of body, from small of back to pit of stomach downward; extremities are cold to touch.≡ more ...