A brain tumor can cause tremors, usually when it presses on or grows into the brain areas that control smooth movement. Still, it sits far down the list of reasons a hand starts to shake.1Cala Health. Understanding Brain Tumor Tremors: Causes & Symptoms – Cala Health Shaking happens when something disrupts the brain’s movement-control areas, and a tumor is only one of many things that can do that.2Cala Health. Understanding Brain Tumor Tremors: Causes & Symptoms – Cala Health When a tumor is the cause, the tremor rarely travels alone, and that pattern is what helps doctors tell it apart.
What Usually Causes Tremors Instead
Tremor is involuntary, rhythmic shaking that can affect the hands, arms, head, legs, or torso.3Cala Health. Understanding Brain Tumor Tremors: Causes & Symptoms – Cala Health The most common causes are essential tremor, a lifelong-leaning condition that makes the hands shake during use, and Parkinson’s disease.4Cala Health. Understanding Brain Tumor Tremors: Causes & Symptoms – Cala Health Multiple sclerosis, certain prescription drugs, metabolic problems, and alcohol or drug withdrawal can also bring on tremor.5Cala Health. Understanding Brain Tumor Tremors: Causes & Symptoms – Cala Health A new tremor on its own is far more likely to come from one of these than from a tumor.
Caffeine, poor sleep, and anxiety can all cause a fine shake, and it fades when the trigger goes. Thyroid problems and low blood sugar are metabolic causes that a simple blood test can check.
Shaking in both hands is typical of common causes like essential tremor, and a tremor that stays steady over years more often reflects a benign condition, though neither rules out other causes. Doctors look at the whole picture, not the tremor alone, before ordering a scan.
That is why the first questions are simple ones: when it started, whether it is getting worse, which medicines, alcohol, or caffeine you use, and whether relatives have a similar tremor. The doctor will also want to know when the shake appears: at rest with the hand relaxed in your lap, while holding a position with arms held out, or while reaching toward something. A shake that is mostly present at rest is more typical of Parkinson’s disease, while essential tremor usually shows when the hands are in use. Real tremors can mix patterns, but this is why a doctor asks you to hold your arms out and then touch your nose.
How a Brain Tumor Can Cause Shaking
Tremors usually come from trouble in brain areas that control movement, such as the cerebellum, the coordination center at the back of the brain.6Cala Health. Understanding Brain Tumor Tremors: Causes & Symptoms – Cala Health A tumor in or near the cerebellum or its pathways can cause a slow, large tremor of the arms, hands, legs, or feet.7National Institute of Neurological Disorders and Stroke (NINDS) / NIH. Tremor A tumor in the thalamus, a relay station deep in the brain, can also cause tremor, though tumors there rarely cause tremor alone.8PubMed. Tremor Secondary to a Thalamic Glioma: A Case Report Damage in part of the midbrain can produce a distinctive slow tremor.9PubMed Central. Vim thalamotomy for Holmes’ tremor secondary to midbrain tumour
These areas are linked by a loop that runs from the cerebellum through the thalamus to the movement cortex, and disrupting it can cause tremor.10MNJ (Malang Neurology Journal). MIXED HOLMES AND CEREBELLAR TREMOR FOLLOWING RESECTION OF A FOURTH VENTRICULAR MEDULLOBLASTOMA: A CASE REPORT The cerebellum compares the movement you intended with the one actually happening and fine-tunes the difference as you go. When that correction is disrupted, a reaching hand can overshoot and then swing back, producing a wobble that grows near the target. That is why cerebellar problems often show up in tasks like drinking from a cup or buttoning a shirt.
Location matters more than size. A small tumor placed in a busy movement hub can cause obvious symptoms, because many pathways pass through a tiny space. A larger tumor in a quieter area may cause few symptoms for a long time, and slow-growing tumors give the brain time to adapt, so symptoms may appear late even when the tumor is already sizable. Tumors in language or thinking areas cause different problems, such as speech trouble or confusion, rather than a tremor.
The side of the body also carries a clue. For the thalamus, the brain’s wiring mostly crosses, so a tumor on the left tends to affect the right arm or leg. The cerebellum is different: its pathways cross twice, so a problem there usually shows up on the same side of the body as the damage.
What a Tumor-Related Tremor Looks Like
Tremor from cerebellum damage gets worse at the end of a purposeful movement, such as pressing a button. Doctors call this an intention tremor.11National Institute of Neurological Disorders and Stroke (NINDS) / NIH. Tremor You may notice it most when bringing a spoon to your mouth or touching a target. It can come with overshooting the target, which has even been mistaken for seizure jerks.12MNJ (Malang Neurology Journal). MIXED HOLMES AND CEREBELLAR TREMOR FOLLOWING RESECTION OF A FOURTH VENTRICULAR MEDULLOBLASTOMA: A CASE REPORT
Holmes tremor is a mixed pattern. It combines shaking at rest, while holding a posture, and during movement, usually in one arm.13PubMed Central. Vim thalamotomy for Holmes’ tremor secondary to midbrain tumour It is large and slow, under about 4 to 5 beats per second.14Current Clinical Neurology. Holmes’ Midbrain Tremor It is usually caused by a structural lesion in the brainstem, cerebellum, or thalamus, from stroke, tumor, MS, injury, or infection.15Current Clinical Neurology. Holmes’ Midbrain Tremor
Real cases show how gradual this can be. In one reported case, a 78-year-old woman’s one-sided arm tremor grew over 7 years before a thalamic tumor was found.16PubMed Central. Thalamic tumour presenting with Holmes’ tremor: diagnostic difficulties Her tremor was there at rest and during activities, and it made her spill drinks.17PubMed Central. Thalamic tumour presenting with Holmes’ tremor: diagnostic difficulties In another case, a 50-year-old man had a year of right-hand tremor before other nerve signs led to a scan that found a slow-growing thalamic tumor.18PubMed. Tremor Secondary to a Thalamic Glioma: A Case Report
Compared with essential tremor, the differences are tendencies. Essential tremor is usually a faster, finer shake that affects both hands and often runs in families. A tumor-related tremor is more often slow, coarse, and limited to one side. Essential tremor tends to change little over years, while a tumor-related tremor tends to worsen as the tumor grows. Only an exam, and sometimes imaging, can tell them apart reliably.
Before an appointment, a few simple checks help. See whether the shake appears when your hand rests in your lap or mainly when you use it. Slowly touch your finger to your nose or to a cup and notice whether the shake grows as you get closer. Note whether one side or both are affected. A short phone video of a typical episode lets the doctor see a tremor that may not show up in the exam room.
Warning Signs That Usually Come With It
People whose parkinsonism (Parkinson’s-like symptoms) comes from a tumor rarely have only movement symptoms.19PubMed Central. Tumoral parkinsonism—Parkinsonism secondary to brain tumors, paraneoplastic syndromes, intracranial malformations, or oncological intervention, and the effect of dopaminergic treatment Headaches, seizures, and behavior changes typically come along with the shaking.20PubMed Central. Tumoral parkinsonism—Parkinsonism secondary to brain tumors, paraneoplastic syndromes, intracranial malformations, or oncological intervention, and the effect of dopaminergic treatment Their symptoms are also often atypical compared with ordinary Parkinson’s disease.21PubMed Central. Tumoral parkinsonism—Parkinsonism secondary to brain tumors, paraneoplastic syndromes, intracranial malformations, or oncological intervention, and the effect of dopaminergic treatment A strong tremor with few other Parkinson’s signs can be the clue that prompts a scan.22PubMed Central. Brain Tumor Presenting with Parkinsonism In one thalamic tumor case, weakness, stiffness, or changed reflexes on one side led to the scan.23PubMed. Tremor Secondary to a Thalamic Glioma: A Case Report
Some signs call for prompt medical attention when they appear with shaking:
- New headaches, especially ones that are worse in the morning or come with vomiting
- A first seizure at any age
- Personality change, confusion, or memory trouble
- Weakness, numbness, or clumsiness on one side
- Balance problems or a staggering walk
At the visit, the doctor tests reflexes, strength, coordination, and how the tremor behaves. Blood tests can check thyroid and other metabolic causes. An MRI scan of the brain is the test that shows or rules out a tumor, and most scans done for tremor alone come back without one.
Does the Tremor Improve After Treatment
After surgery for tumors at the back of the brain, tremor improved right away or gradually when the tumor had only pressed on the cerebellum’s pathways.24Journal of Neurosurgery. Impact of surgical treatment on tremor due to posterior fossa tumors It did not improve when the tumor had grown directly into a key cerebellar structure.25Journal of Neurosurgery. Impact of surgical treatment on tremor due to posterior fossa tumors In one case, a thalamic tumor’s tremor improved with treatment.26PubMed. Tremor Secondary to a Thalamic Glioma: A Case Report Whether the tumor pressed or invaded largely decides recovery.
If a tumor only pressed on movement pathways, removing the pressure gives them a chance to recover. If it grew into a movement structure, the tissue itself may be damaged, so the tremor can remain. Recovery can be immediate or gradual, so a tremor still present soon after surgery doesn’t mean it will never improve.
When tremor persists, there are options. Holmes tremor from a midbrain tumor has been treated with a small targeted operation on the thalamus.27PubMed Central. Vim thalamotomy for Holmes’ tremor secondary to midbrain tumour Deep brain stimulation, an implanted device that sends mild pulses to the thalamus, has eased Holmes tremor from brainstem lesions.28PubMed. Deep brain stimulation of the nucleus ventralis intermedius for Holmes (rubral) tremor and associated dystonia caused by upper brainstem lesions. Report of two cases
Ask the surgical team whether the tumor is pressing on movement areas or growing into them, since that shapes how likely the tremor is to improve. Ask how soon any improvement might be expected and what counts as a normal pace. Ask whether rehabilitation such as occupational therapy could help with daily tasks.
In the meantime, small adjustments help. Weighted utensils and lidded cups reduce spills, and bracing your elbow on a table steadies the hand.
When Tumor Treatment Causes the Shaking
Several medicines used around a brain tumor can cause tremor. Cancer drugs such as thalidomide and cytarabine can.29MedlinePlus. Drug-induced tremor So can seizure medicines such as divalproex (Depakote), which are often given to people with brain tumors.30MedlinePlus. Drug-induced tremor Steroids and immune-suppressing drugs like cyclosporine and tacrolimus can as well.31MedlinePlus. Drug-induced tremor New shaking during treatment is worth reporting, since a dose change may help.
A medicine-related tremor often begins soon after a new drug is started or a dose is raised. It often affects both hands, unlike many tumor-related tremors that favor one side. Timing is a useful clue but not proof, so the care team has to weigh it against the rest of the picture.
Never stop a seizure medicine or steroid on your own, because stopping suddenly can bring on seizures or other serious problems. Call the care team, say when the shaking began and what changed around then, and let them decide whether to adjust the dose or switch drugs. A short list of every medicine, with the date of any dose change, makes that call far more useful.
Surgery can also be the trigger. Tremor can appear after removal of a tumor at the back of the brain, as in one child whose arm developed a mixed tremor after surgery.32MNJ (Malang Neurology Journal). MIXED HOLMES AND CEREBELLAR TREMOR FOLLOWING RESECTION OF A FOURTH VENTRICULAR MEDULLOBLASTOMA: A CASE REPORT Some children may struggle with walking, balance, eating with utensils, and writing after such surgery.33St. Jude Children’s Research Hospital. Posterior Fossa Syndrome