Last updated: 2026-10-08
Are Hands That Shake While Holding a Cup Different From Hands That Shake at Rest?
"Shaky hands" (sujeonjeung in Korean) is the casual, everyday name for hand tremor. Medically, tremor refers to an involuntary, rhythmic shaking movement of a part of the body (Bhatia Kailash P et al., 2018).
Tremor differs greatly in character depending on when and in what state it appears. If your fingertips or fingers shake on their own while your hands rest comfortably on your lap, this is a resting tremor. If your fingertips quiver while you hold both arms straight out in front of you in a fixed position, it is classified as a postural tremor. If the shaking appears while you are moving to do something, such as gripping a pen to write or bringing a spoon to your mouth to eat soup, it is considered an action tremor.
When you lift a cup to drink water, two things happen together: holding the cup steady at a set height (maintaining a posture) and tilting it toward your mouth (a movement). To identify exactly what kind of tremor appears at that moment, the conditions under which it occurs need to be examined one by one: whether it shows up while the hand is completely at rest, or while holding a particular posture or making a hand movement (Bhatia Kailash P et al., 2018).
My Tremor Gets Worse Only on Days I Drink Coffee or Don't Sleep Well
Everyone has a fine physiological tremor too small to see. When fatigue builds up, after a poor night's sleep, when tension runs high, or on days when you drink a lot of caffeinated beverages, this normal tremor can temporarily grow into a noticeable hand tremor. Once the fatigue lifts, you get enough sleep, or you cut back on coffee, this exaggerated physiological tremor gradually settles down. If hand tremor continues even after you reduce these everyday triggers, it is necessary to check whether there is another underlying cause (Wagle Shukla Aparna, 2022).
When tremor persists, the next step is to check whether a medication you are currently taking is the cause. Amiodarone (a drug for arrhythmia), certain antidepressants, lithium (used for bipolar disorder), valproic acid (an epilepsy drug), and bronchodilators (used for asthma and other bronchial conditions) are typical examples of medications that can cause hand tremor (Baizabal-Carvallo José Fidel et al., 2022). The risk of drug-induced tremor can be higher when you take several medications together, take a high dose, or are older. Even if you suspect a medication, do not stop a prescribed drug on your own. Any switch or dose reduction should be made in consultation with the doctor who prescribed it (Baizabal-Carvallo José Fidel et al., 2022).
If your hands shake and you also often feel your heart pounding, find heat unusually hard to tolerate, or lose weight even though you are not eating less, hyperthyroidism needs to be ruled out. A blood test of thyroid hormone levels is used to determine whether a hormonal imbalance is causing the tremor.
When Both Hands Have Been Shaking for Years: Suspecting Essential Tremor
If tremor in both hands has kept recurring for years and gets in the way of daily life even on days when you have had no coffee and plenty of rest, you should be examined for essential tremor. According to the international classification of tremors, action tremor in both arms and hands lasting at least 3 years is the core criterion for essential tremor (Bhatia Kailash P et al., 2018).
Even with essential tremor, the shaking can temporarily become much larger on days when you are tense or have had a caffeinated drink. Family history is also checked: whether a parent, sibling, or other family member has had a similar hand tremor (Wagle Shukla Aparna, 2022).
Essential tremor tends to progress slowly over time. Besides the hands, it may also come with head shaking or a trembling voice. However, tremor that affects only the head or voice without hand tremor, and task-specific tremor, in which the hand stiffens and shakes only during writing while other daily movements are unaffected, are distinguished from essential tremor and classified as separate clinical categories (Bhatia Kailash P et al., 2018). A neurological examination assesses comprehensively whether other signs of nervous system abnormality, such as changes in gait or reflexes, are present alongside the tremor (Wagle Shukla Aparna, 2022).
If One Hand Trembles at Rest and Movements Slow Down
If hand tremor starts in one hand rather than both and gets worse while the hand is resting without holding anything, Parkinson's disease should be suspected. In particular, if a resting tremor, in which the fingers move as if rolling something between them while at rest, comes with movements that become noticeably slower when buttoning clothes or walking, and with muscle rigidity that stiffens the joints of the arms and legs, a neurology consultation is needed to make an accurate distinction (Bötzel Kai et al., 2014). If your hand shakes while at rest or the tremor starts on one side, and your steps become shorter and your balance breaks down, see a specialist without delay.
At Guri Top Bone Clinic, a board-certified neurologist observes you directly, step by step: at rest with your hands placed comfortably on your knees, holding your arms stretched out in front of you, and gripping and lifting a cup of water. The neurologist also checks the speed of rapid finger-tapping movements and the resistance felt when your joints are bent and straightened, looking for signs of neurological abnormality. If, in addition to hand tremor, you have ever lost consciousness or had a seizure, an EEG (electroencephalogram) is performed to check for abnormal electrical signals in the cerebral cortex.
After the examination, electromyography (EMG) and nerve conduction studies are performed to objectively record the subtle electrical responses in the muscles and nerves. According to the literature, electrophysiological assessment of tremor allows a precise analysis of the rhythm and frequency of muscle contractions, which helps supplement the clinical examination and identify the detailed features of the tremor (Vial Felipe et al., 2019).
What Treatment Options Are Available If Tremor Disrupts Daily Life?
If writing has become difficult, you spill soup at the table, or you become conscious of other people's eyes when your hand shakes as you lift a cup, you should consider treatment. Whether to treat is decided not simply by whether tremor is present, but by weighing together how much it disrupts daily life, the demands of your work, and the psychological burden it places on your relationships with others (Wagle Shukla Aparna, 2022). If the cause turns out to be a medication side effect or thyroid disease, the focus is on improving the tremor by adjusting the responsible medication or through medical treatment.
For patients diagnosed with essential tremor, beta-blockers such as propranolol or anticonvulsants such as primidone are recommended as first-line options for symptom control (Ferreira Joaquim J et al., 2019). If the tremor does not respond to medication, or is so severe that daily life becomes impossible, deep brain stimulation targeting the thalamus or an MRI-guided focused ultrasound procedure is considered as a treatment option (Ferreira Joaquim J et al., 2019).
Following a detailed evaluation by a board-certified neurologist, Guri Top Bone Clinic provides transcranial magnetic stimulation (TMS), a non-drug treatment, for patients with hand tremor.
Sung-Woog Lee · Medical Director · Board-Certified Neurologist · Guri Top Bone Clinic
References
- Bhatia Kailash P, Bain Peter, Bajaj Nin, Elble Rodger J, Hallett Mark, Louis Elan D (2018). Consensus Statement on the classification of tremors. from the task force on tremor of the International Parkinson and Movement Disorder Society.. Mov Disord. PMID: 29193359
- Baizabal-Carvallo José Fidel, Morgan John C (2022). Drug-induced tremor, clinical features, diagnostic approach and management.. J Neurol Sci. PMID: 35220110
- Wagle Shukla Aparna (2022). Diagnosis and Treatment of Essential Tremor.. Continuum (Minneap Minn). PMID: 36222768
- Bötzel Kai, Tronnier Volker, Gasser Thomas (2014). The differential diagnosis and treatment of tremor.. Dtsch Arztebl Int. PMID: 24739887
- Vial Felipe, Kassavetis Panagiotis, Merchant Shabbir, Haubenberger Dietrich, Hallett Mark (2019). How to do an electrophysiological study of tremor.. Clin Neurophysiol Pract. PMID: 31886436
- Ferreira Joaquim J, Mestre Tiago A, Lyons Kelly E, Benito-León Julián, Tan Eng-King, Abbruzzese Giovanni (2019). MDS evidence-based review of treatments for essential tremor.. Mov Disord. PMID: 31046186
Frequently Asked Questions
Q. If my hand shakes only when I write, is it still essential tremor?
If your hand shakes only while writing, it needs to be determined whether this is a tremor that appears during a specific task or an abnormal muscle contraction in the hand.
Q. Do I have to wait until 3 years after my tremor starts before I can see a doctor?
Three years is the time criterion used to classify essential tremor, not a waiting period before you can start seeing a doctor.
Q. If someone in the family has hand tremor, will the children get it too?
Genetic factors are involved in essential tremor, but having a family history does not mean that every child will develop it.
Q. What should I do if I'm taking a medication that can cause tremor?
Do not stop the medication or reduce the dose on your own. Instead, write down the drug name, the dose, the date you started it or the dose was increased, and when the tremor began. Based on this record, the clinic or hospital that prescribed the drug can assess whether it is linked to the tremor and decide whether to adjust the dose or switch medications.