Below are the main rubriks (i.e strongest indications or symptoms) of Arsenicum Album in traditional homeopathic usage, not approved by the FDA.
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Sensitive head in open air
Delirium tremens; cursing and raving; vicious
Head is in constant motion
Headaches relieved by cold, other symptoms worse
Periodical burning pains, with Restlessness; with cold skin
Hemicrania, with icy feeling of scalp and great weakness
Scalp ITCHES intolerably; circular patches of bare spots; rough, dirty, sensitive, and covered with dry scales; nightly burning and itching; dandruff
Scalp very sensitive; cannot brush hair.≡ more ...