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Materia Medica Viva Volume 6 – page 1403

Indignation is another key-note of this remedy. When insulted, Calcarea phosphorica does not stay in order to fight back, but rather leaves with a sense of indignation. It is interesting that they can even become indignant at unpleasant dreams. This is another point where they resemble Staphysagria. Staph., however, is sweet and mild and accepting, while Calcarea phosphorica is vehement, angry, censorious and displeased with others and themselves. Though the symptom is the same, the context is different.
Sluggishness
Without knowing what exactly is wrong or why, Calcarea phosphorica patients realise that something is awry with their system. They may be functioning at their optimum when they suddenly find themselves becoming tired more easily. They feel sluggish. They start to lose interest in pursuing their daily activities, whether it be work or play. Their minds are duller, less vital. In order to mobilise their minds, they need stimulation, either mental, i.e., a good conversation, or physical, such as a good strong coffee. They are unable to explain the reason for their vague discontent. They only perceive that they are no longer easily excited nor enthusiastic about life, and that they are tired and do not comprehend things as readily as before.
The sluggishness on the mental level can be termed a ‘mental flabbiness’, and parallels the physical flabbiness that characterises this remedy —similar to what was written in my description of Calcarea carbonica. In Calcarea phosphorica people, the ability to reflect is very compromised. (This is exactly the opposite of Chamomilla, where the ability to reflect is quite active.) Mental tasks require far more time to complete than they did previously. Mental exertion becomes very difficult and may even provoke a headache. Indeed, Calcarea phosphorica is one of the major remedies for headaches in school children (compare Natrum carbonicum). Calcarea carbonica is the major remedy for headaches from physical rather than mental exertion.