Tremors: There are two main categories of tremors, 1) normal, and 2) abnormal. Abnormal tremors can be classified as resting, postural (action), intention (ataxic), and rubral tremor. Causes of tremors are very diverse to include other diseases or conditions, medications, and toxins. Some clinical conditions are associated with types of tremors (such as familial and essential tremor). Parkinson tremor is generally associated with Parkinson's disease. Treatment for tremors depends up on the cause.