Titubations are irregular, involuntary movements or tremors, particularly of the limbs or head, that can be caused by a number of conditions including Parkinson's disease, drug use, and cerebellar ataxia. Synonyms for titubations include tremors, shaking, quivering, shuddering, quavering, and twitching. In some cases, titubations may also be referred to as spasms, convulsions, or seizures, although these terms typically describe more severe and prolonged movements. When seeking medical treatment for titubations, doctors may use various other terms to describe the symptoms, such as dyskinesia, myoclonus, or dystonia, depending on the nature and location of the movements.