Different types of tremors
Tremors have different names depending on when they occur, such as:
- resting tremor, which occurs at rest
- postural tremor, which occurs when a person assumes a specific posture
- intention tremor or action tremor, which gets worse during an intentional movement
Tremors are also described based on how they are caused. This includes how severe the movements are and what parts of the body are affected. Some common types are listed here.
Essential tremor
This is the most common type of tremor. It starts on one side of the body. Sometimes, it is progressive. This means that the other side of the body becomes affected too. It mostly affects the hands. The head, voice, tongue, legs and trunk can also be involved.
Physiological tremor
This is a mild form of tremor without an underlying cause. Physiological tremor can affect all voluntary muscle groups. It is made worse by fatigue, low blood glucose levels, metal poisoning, stimulants, alcohol withdrawal and heightened emotion. This is a fast tremor, and is not usually bothersome to the child.
Dystonic tremor
The dystonic tremor is triggered when the child is in a certain posture or moves a certain way. Rest and touching the affected muscle may help to relieve the tremor.
Cerebellar tremor
This is a slow tremor that occurs during movements that have a purpose, like pressing a button. It is caused by brain damage in the cerebellum. Common causes of cerebellar damage in children include multiple sclerosis, stroke and tumours. The tremor is triggered on the same side of the body as the brain damage.
Parkinson's tremor
This type of tremor is also called "pill-rolling." The tips of the thumb and index finger come together and then apart in a circular movement. Parkinson's tremor can also affect the chin, legs and trunk. It is an early sign of Parkinson's disease, which most often occurs after the age of 60. It is rarely seen in children, but Parkinson's tremor can also occur as a result of brain damage.