The three types of tremors are resting tremors, postural tremors, and intention (kinetic) tremors. Each is defined by when the shaking happens: while your muscles are relaxed, while holding a position, or while moving toward a target. This distinction matters because it points to different underlying causes and different treatments.
Resting Tremors
A resting tremor happens when your muscles are completely relaxed and you’re not trying to move. The classic example is a hand trembling in your lap while you’re sitting still. It typically stops or decreases once you start using the affected limb, which is one of the easiest ways to recognize it.
Resting tremors are the hallmark of Parkinson’s disease. They often start on one side of the body, frequently in a hand, and may look like a “pill-rolling” motion between the thumb and fingers. The underlying problem involves dopamine-producing brain cells that are dying off, which disrupts the circuits responsible for smooth motor control. Research confirms that resting tremors in Parkinson’s respond to dopamine-boosting medications, especially at higher doses. Because resting and action tremors in Parkinson’s appear to rely on distinct brain networks, a person with Parkinson’s can have a resting tremor that responds well to medication while also developing an action tremor that behaves differently.
Postural Tremors
A postural tremor appears when you hold a body part against gravity. If you stretch your arms straight out in front of you and notice shaking, that’s a postural tremor. It’s absent when your limbs are fully supported and at rest.
The most common condition behind postural tremors is essential tremor, one of the most prevalent movement disorders. Essential tremor typically affects both hands and arms, though it can also involve the head, voice, or legs. It tends to first appear either during adolescence or between ages 40 and 50, and it runs in families 50 to 70 percent of the time. Some people have a mild tremor that stays stable for years. Others experience a slow worsening that eventually makes everyday tasks like writing, drinking from a cup, or buttoning a shirt more difficult.
Not all postural tremors signal essential tremor, though. An exaggerated version of the normal physiological tremor everyone has can become visible during stress, caffeine intake, certain medications, or thyroid problems. The difference is that this enhanced physiological tremor usually goes away once the trigger is removed.
Intention (Kinetic) Tremors
An intention tremor shows up during purposeful movement and gets worse as your hand or finger approaches a target. If you try to touch your nose with your fingertip, the shaking intensifies right at the end of the reach rather than staying steady throughout. Doctors sometimes call this a kinetic tremor, with “intention tremor” referring specifically to that worsening-at-the-target pattern.
This type of tremor points to problems in the cerebellum, the brain region responsible for coordinating and fine-tuning movement. Damage to the cerebellum or its connections, whether from multiple sclerosis, stroke, or other neurological conditions, disrupts the brain’s ability to predict and correct movements in real time. The result is an irregular, jerky motion that overshoots or undershoots the target, sometimes oscillating back and forth before settling. Even once the finger reaches the target, swaying may continue because the brain can’t stabilize the position. Intention tremors are often accompanied by other coordination problems like clumsy gait or difficulty judging distances.
How Doctors Tell Them Apart
Distinguishing between tremor types starts with observing exactly when the shaking occurs. During a neurological exam, you’ll be asked to rest your hands in your lap (checking for resting tremor), hold your arms outstretched (checking for postural tremor), and then perform a finger-to-nose task, repeatedly touching your nose and then the examiner’s finger (checking for intention tremor). Doctors also look at finger tapping speed to detect signs of Parkinson’s-related stiffness and slowness, and may ask you to write a sentence or pour water between cups to gauge how the tremor affects daily function.
The International Parkinson and Movement Disorder Society classifies tremors along two axes. The first captures clinical features: when the tremor started, where it appears on the body, what activates it, and whether other neurological signs are present. The second axis addresses the cause, whether it’s genetic, acquired from another condition, or unknown. This two-axis system helps clinicians move from observing a symptom to identifying a specific tremor syndrome.
Treatment by Tremor Type
Treatment depends heavily on which type of tremor you have, because the underlying brain circuits involved are different.
For essential tremor (postural), first-line medications include a beta-blocker called propranolol and an anti-seizure drug called primidone. Propranolol is typically prescribed at doses that range widely depending on how severe the tremor is. Primidone is usually started at a very low dose at bedtime and gradually increased, because starting too high can cause dizziness and drowsiness. If neither works well enough, another anti-seizure medication, topiramate, is sometimes added.
For Parkinsonian resting tremors, dopamine-replacement therapy is the cornerstone. Treatment usually begins at a low dose and is increased until symptoms are adequately controlled. In younger patients, doctors sometimes start with other medications that mimic or preserve dopamine to delay certain long-term side effects of dopamine-replacement drugs.
Intention tremors caused by cerebellar damage are the hardest to treat with medication alone. There is no single reliable drug for them, and management often focuses on treating the underlying condition, such as controlling inflammation in multiple sclerosis, alongside physical and occupational therapy to improve coordination.
When Medication Isn’t Enough
For tremors that don’t respond adequately to medication, two advanced options exist: deep brain stimulation (DBS) and focused ultrasound.
DBS involves implanting thin electrodes in specific brain areas that deliver continuous electrical pulses to disrupt the abnormal signals causing tremor. For essential tremor, bilateral DBS can reduce tremor severity by 66 to 78 percent after one year. For Parkinson’s disease, bilateral stimulation targeting a deeper brain structure can reduce tremor by up to 80 percent at one year, with benefits lasting a decade or more (one study showed 69 percent improvement sustained over 10 years). DBS is adjustable and reversible, meaning settings can be fine-tuned over time.
MR-guided focused ultrasound is a newer, noninvasive option that uses concentrated sound waves to create a small, precise lesion in the tremor-producing brain circuit. It doesn’t require open surgery, which appeals to patients who aren’t candidates for DBS or prefer to avoid it. However, the lesion is permanent and not adjustable, and tremor symptoms recur in roughly 8 to 14 percent of patients over five years. Studies comparing the two approaches have found that DBS, particularly bilateral DBS, provides greater tremor reduction than a single focused ultrasound treatment.