A tremor is an involuntary, rhythmic shaking or quivering of a part of the body, often affecting the hands, arms, or legs. It can occur at rest or during movement and is commonly associated with conditions like Parkinson's disease, essential tremor, or multiple sclerosis. Tremors can vary in intensity and frequency, impacting daily activities. Tremors can be classified into different types based on their cause and characteristics. For example, resting tremors occur when muscles are relaxed, while action tremors happen during voluntary movement. Treatment options may include medications, therapy, or lifestyle changes to help manage symptoms.