Below are the main rubriks (i.e strongest indications or symptoms) of Causticum in traditional homeopathic usage, not approved by the FDA.
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Confusion in the head, as if it were compressed.
Feeling of intoxication, and as if momentarily on the point of falling.
Digging, with sudden shocks in the head.
Congestion in the head, with ebullition and noise internally.
Heat and sensation of burning in the head.
Tightness and shootings in the head.
Sensation of torpor in the occiput.
Attacks of headache, with nausea.
Headache in the morning, sometimes on waking, with sensation, as from a bruise, in the brain.
Nocturnal pain in the head, as if from an abscess in the brain.
Dull and pressive headache, which occasions gloominess, and is felt chiefly in the forehead or in the occiput.
Shooting pains, esp. in the temples.
Tensive or compressive pains in the head.
The headache sometimes exhibits itself only on one side (l.).
Tension and tightness in the head, and of the scalp (forehead and temples).≡ more ...