A rhythmic, quivering movement of muscles that can be caused by diseases such as Parkinson disease, side effects of medication, or old age.

An unintentional, oscillating to-and-fro muscle movement about a joint axis.

Cyclical movement of a body part that can represent either a physiologic process or a manifestation of disease. Intention or action tremor, a common manifestation of CEREBELLAR DISEASES, is aggravated by movement. In contrast, resting tremor is maximal when there is no attempt at voluntary movement, and occurs as a relatively frequent manifestation of PARKINSON DISEASE.

Involuntary trembling or quivering.

The shaking movement of the whole body or just a certain part of it, often caused by problems of the neurons responsible for muscle action.

Unintentional trembling or shaking of one or more body parts.

A tremor is a neurological condition that includes shaking or trembling movements in one or more parts of your body. It most often affects the hands. But it can also affect the arms, legs, head, vocal cords, and torso (trunk). A tremor is involuntary, meaning that you cannot control it. It happens because of muscle contractions. A tremor may come and go, or it may be constant. It can happen on its own or be caused by another disorder. It is not life threatening, but it may cause challenges. It can make it hard to do daily life tasks such as writing, typing, eating, and dressing. In some cases, a tremor can even lead to disabilities. There are several types of tremor, including: Essential tremor, sometimes called benign essential tremor or familial tremor. This is the most common type. It usually affects both your hands and arms while you are moving them. It can also affect your head, voice, or legs.; Parkinsonian tremor, which is a common symptom in people who have Parkinson's disease. It usually affects one or both hands when they are at rest, but it can affect the chin, lips, face, and legs.; Dystonic tremor, which happens in people who have dystonia. Dystonia is a movement disorder in which you have involuntary muscle contractions. The contractions cause you to have twisting and repetitive movements. It can affect any muscle in the body. Generally, tremor is caused by a problem in the deep parts of the brain that control movements. For most types, the cause is unknown. Some types are inherited and run in families. There can also be other causes, such as: Neurologic disorders, including multiple sclerosis, Parkinson's disease, stroke, and traumatic brain injury; Certain medicines, such as asthma medicines, chemotherapy, corticosteroids, and medicines used for certain psychiatric and neurological disorders; Alcohol use disorder (AUD) or alcohol withdrawal; Poisoning from certain toxic substances, including pesticides and heavy metals such as mercury and lead; Hyperthyroidism (overactive thyroid); Liver or kidney failure; Anxiety or panic; Too much caffeine. Anyone can get tremor, but it is most common in middle-aged and older adults. For certain types of tremor, having a family history raises your risk of getting it. Symptoms of tremor may include: Rhythmic shaking in the hands, arms, head, legs, or torso; Shaky voice; Difficulty writing or drawing; Problems holding and controlling utensils, such as a spoon. Your health care provider may use many tools to make a diagnosis: A medical history, which includes asking about your symptoms; A physical exam, which includes checking: Whether the tremor happens when the muscles are at rest or in action; The location of the tremor; How often you have the tremor and how strong it is.; A neurological exam, including checking for: Problems with balance; Problems with speech; Increased muscle stiffness.; Blood or urine tests to look for the cause; Imaging tests to help figure out if the cause is damage to your brain; Tests that check your abilities to do daily tasks such as handwriting and...

A disorder characterized by the uncontrolled shaking movement of the whole body or individual parts.

Tremors are involuntary, rhythmic, oscillatory movements of reciprocal, antagonistic muscle groups, typically involving the hands, head, face, vocal cords, trunk, or legs. Diagnosis is clinical. Treatment depends on the cause and type of tremor and may involve avoidance of triggers (physiologic), propranolol or primidone (essential),...