The Increased Physiological Tremor is given, as the name suggests, if the actual physiologic tremor is increased. Often the “normal” physiological tremor is not visible with the eye and manifests with a high frequency and low amplitude. The Increased Physiologic Tremor is visible though the frequency is similar to the frequency of a “normal” physiologic tremor. The Increased Physiologic Tremor can manifest as postural tremor or as rest tremor. To distinguish an Increased Physiologic Tremor from an Essential Tremor can be difficult. An evidence for differentiating these tremor types is the high frequency; the Increased Physiologic Tremor is seldom lower than 7.5 Hz. This tremor type can also manifest after the intake of medication or other substances like alcohol.
Drug-induced and toxic tremors can occur after the intake of substances (e.g. medication) in many forms. The most common type is the Increased Physiologic Tremor; this tremor type can develop after taking medication for asthma or antidepressants. Another possibility is the increase of a Parkinsonian tremor after the intake of neuroleptics or dopamine antagonists. Due to intoxication of substances like lithium an intentional tremor can occur. An intentional tremor can also manifest after the consumption of alcohol; during a withdrawal tremor can manifest as an Increased Physiologic Tremor.
A Psychogenic Tremor can occur without any physical cause. Most of the time there is a psychological cause behind such a tremor, like a trauma. In former times the Psychogenic Tremor was called shell shock because soldiers, who have come home from war, often had a tremor. The psychogenic tremor can imitate every form of organic tremor but it is usually possible to differentiate the Psychogenic Tremor with measurements. About half the patients with a Psychogenic Movement Disorder are suffering from a Psychogenic Tremor.
Dystonia is a collective term for neurological movement disorders where the muscles contract continuously and uncontrollably. The motor centre in the brain of patients is damaged; the muscle contractions are the consequence. Tremor is a possible symptom of dystonia. The Dystonic Tremor can manifest in the part of the body that is affected by the dystonia; it can also occur as so-called bilateral postural tremor in the hands.
All described tremor types are just a selection of many tremor types. Tremor is a very complex topic and it can occur in many different varieties.
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