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Materia Medica Viva Volume 8 – page 1684

Irritability and Excitability
When such a state of lack of enjoyment and of impotence or frigidity is reached, irritability will come on. There is a very peevish and irritable mood, with an inclination to get angry. ‘Very sensitive, hot¬headed and vehement’ (Hahnemann). The patients tend to quarrel and scold, with an opinionated, censorious mood that can amount to real fury, with shouting and shrieking. During such irritable spells, they may become completely unreasonable. They are easily offended, even about trifles; they take everything in bad part and become abusive. ‘Easily becoming very violent after siesta, with great ill-humour.’ Or: ‘Most extreme irritability; the slightest vexation runs through the whole body so that the knees give way.’ Irritable states may be accompanied by a very peevish mood where nothing can make them glad or joyful. ‘Peevish, irritable, no joy in music.’ But the irritable spells will sometimes also alternate with cheerfulness.
The tendency to irritability may also take the form of hysteria, hysterical disorders that gradually become worse. The nervous system is ‘extremely sensitive to noise, touch, excitement or anything unusual’ (Kent). All self-control is lost, with foolish actions and speech; and with twitching, jerking, and easy starting, even in sleep. This type of foolish behaviour, together with forgetfulness and even something like imbecility, may also precede a fit of epilepsy, or there are fits of spasmodic laughter before, during or after an epileptic attack. In connection with the easy excitability, a general inclination to spasmodic attacks can be observed: chorea, epilepsy, twitching, tics, and so on.
Emotional excitement will also cause other symptoms, especially stammering. This is a strong symptom of Causticum: when the individual is not excited, when he is with his usual friends or family members, he can converse quite ordinarily without a trace of stuttering, but when the emotions are stimulated, when fear, self-¬consciousness, etc. are felt, the stammering comes on. The intensity