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Materia Medica Viva Volume 3 – page 534

In the aftermath of a brain haemorrhage, and after the severe symptoms have subsided, we may observe an indifference, an apathy. Has dullness, sluggishness, difficulty of thinking and comprehending, torpor after dreams. He is in a state where he does not take notice of his surroundings, in a dreamy state. Talks loudly in his sleep. Makes loud speeches in his sleep.
Arnica will prove to be a very helpful remedy for alcoholism as it contains the peculiarities of it in its symptomatology.
It is important for the student of Homeopathy to understand that the symptomatology that is described above for the different stages of pathology occurs predominantly, though not exclusively, in the particular stage described here. Similar or identical symptomatology occurring in the acute conditions can appear in the chronic conditions as well, and vice-versa. What the student is required to perceive is the remedy’s underlying trend and its characteristics
Children
Arnica children are capricious, sensitive to pain, with a tendency to shriek every time their mother touches their hands or legs. They shout in their sleep with a weeping, tearful mood, especially after eating, or after coughing. In their fevers they look like Belladona with hot heads and cold bodies. Child cries before whooping cough attack. Angry and irritable from coughing. Shrieking, screaming, shouting aggravate their cough.
Generalities
As we said in the beginning this remedy will be indicated primarily when there is an injury that has resulted from a blow upon the organism with a blunt instrument. If the result of such a blow is a bruised, sore feeling all over the body then the remedy is Arnica. But if the same kind of feeling has resulted from another cause like the overexertion of an organ, or a strain, or an acute disease, Arnica could still be prescribed with success.
If the injury has resulted in lysis of the continuation of the tissues and blood flows freely Arnica is not indicated any more.
You have to have the significant characteristic where a part or the whole body is bruised, as if it had been beaten badly and is black all over.