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Materia Medica Viva Volume 4 – page 944

To summarise we can say that Belladonna produces all varieties of vertigo; perhaps as many as one quarter of all cases of vertigo will require Belladonna.
Head
Very frequently the symptomatology of Belladonna is focused from the cervical region upwards. Perhaps fifty percent of all Belladonna chronic cases involve long-term headaches. Some statistics suggest that a great number of migraine headaches may require Belladonna as a constitutional prescription. Generally, Belladonna produces headaches of vascular origin, but one frequently sees a hormonal component as well, such as migraine occurring in relation to the menstrual cycle or after an abortion or hysterectomy-oophorectomy. Headaches may also arise from abnormal cervical spine curvature or misalignment. The headaches are of various types and may vary even in one individual case. For example, a patient may complain of frequent, minor headaches, which are punctuated once a month by severe headaches, which drive her to bed.
Classically the headaches begin at three p.m.; however, it is even more common to find headaches which originate at eleven a.m. to noon and which then peak at three p.m. or between two and three p.m. Very frequently the headaches may last for long periods of time; e.g., twelve or even twenty-four to forty-eight hours.
Probably the most common headache is pulsating and pounding in quality, but one also sees headaches, which are felt ‘as if a knife were being driven into the head.’ The patient may describe a sensation as if he were being struck by a hammer in one single spot. The common element is the seventy of the pain, for Belladonna headaches are the most intense in the whole of our materia medica. The patient may say that the pain is ‘maddening’, as if the pain will drive him mad, or he may say that the pain is so intense that, “I don’t feel my head anymore.” Frequently the pain is severe enough to provoke nausea and vomiting. When the headache finally subsides, it leaves the patient exhausted. Another type of Belladonna headache can be related to high blood pressure.