Below are the main rubriks (i.e strongest indications or symptoms) of Arnica in traditional homeopathic usage, not approved by the FDA.
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BACK AND NECK
Back and neck
Violent spinal pain, as from sudden rising after long stooping.
Right scapula and small of the back painful, as if beaten.
Bruised pain at inner portion of right scapula.
Sacrum pains, as if beaten.
Weakness of cervical muscles; they do not support the head steadily.
Great sensibility of cervical vertebrae to pressure.≡ more ...