Persistent shakiness usually comes from one of a handful of causes: your body’s natural tremor getting amplified by stress or stimulants, a medication side effect, a metabolic issue like thyroid problems or low blood sugar, or less commonly, a neurological condition like essential tremor or Parkinson’s disease. The good news is that the most common reasons are also the most fixable.
Your Body Already Shakes a Little
Everyone has a baseline tremor. It’s a tiny, invisible vibration in your muscles that happens at rest and during movement. You don’t notice it under normal circumstances. But certain triggers can amplify this natural tremor until it becomes visible and bothersome, a phenomenon called enhanced physiological tremor.
The most common amplifiers are caffeine, nicotine, stress, sleep deprivation, and alcohol withdrawal. If you’re running on coffee and anxiety, that combination alone can make your hands noticeably shaky throughout the day. Certain medical conditions, particularly an overactive thyroid and low blood sugar, can also crank up this baseline tremor. The defining feature of enhanced physiological tremor is that it goes away or significantly improves once you remove the trigger.
If you’re trying to figure out whether this applies to you, start simple. Cut back on caffeine for a few days, prioritize sleep, and see if the shakiness changes. Stress management techniques like breathing exercises and even yoga have been shown to reduce this type of tremor. If you smoke, nicotine is a known contributor worth addressing.
Medications That Cause Shakiness
A surprisingly long list of common medications can cause tremors as a side effect. Antidepressants, particularly SSRIs and tricyclics, are among the most frequent culprits. Asthma inhalers containing albuterol, mood stabilizers like lithium, seizure medications, certain heart medications, steroids, stimulant medications, and even too much thyroid replacement medication can all trigger shakiness.
If your tremor started or worsened around the time you began a new medication, that timing is a strong clue. Don’t stop any prescribed medication on your own, but it’s worth raising the question with whoever prescribed it. In many cases, adjusting the dose or switching to a different drug in the same class resolves the problem.
Thyroid Problems and Blood Sugar
An overactive thyroid (hyperthyroidism) is one of the most common metabolic causes of persistent shakiness. Tremor shows up in roughly 76% of people with an overactive thyroid. The excess thyroid hormone ramps up your body’s sensitivity to adrenaline-like signals, which makes your muscles more reactive. You’d typically also notice a fast heart rate, unintentional weight loss, heat intolerance, or feeling wired and anxious. A simple blood test can confirm or rule this out.
Low blood sugar (hypoglycemia) is another classic trigger. When your blood glucose drops too low, your body releases adrenaline to compensate, and one of the results is trembling. This is especially relevant if you have diabetes, but it can also happen in people who skip meals, eat irregularly, or have reactive hypoglycemia after high-carb meals. If your shakiness tends to improve after eating, blood sugar is worth investigating.
Nutritional Deficiencies
Vitamins B1, B6, and B12 all play essential roles in keeping your nervous system functioning properly. A deficiency in any of these can cause shakiness and tremors in the hands. B12 deficiency is particularly common in older adults, vegetarians and vegans, and people who take certain acid-reducing stomach medications long term. If you fall into any of these groups and have unexplained shakiness, checking your B12 level is a reasonable step.
Essential Tremor
Essential tremor is the most common movement disorder, and it’s the leading neurological cause of chronic shakiness. It typically shows up as a tremor in both hands that happens when you’re actively using them: pouring a drink, writing, eating with a spoon. The tremor cycles at 6 to 12 times per second and tends to run in families.
The key feature that distinguishes essential tremor from Parkinson’s is when the shaking happens. Essential tremor is an action tremor, meaning it’s worst when you’re doing something with your hands. It often gets worse as your hand approaches a target, like bringing a fork to your mouth. Parkinson’s tremor, by contrast, is primarily a resting tremor. It’s most obvious when your hand is relaxed in your lap and tends to decrease when you reach for something. Parkinson’s tremor also cycles more slowly, around 4 to 6 times per second, and usually starts on one side of the body.
Essential tremor is not dangerous, but it can be frustrating and progressively interfere with daily tasks. It often worsens gradually over years. Alcohol temporarily suppresses it in many people, which is sometimes the first thing patients notice, but that’s obviously not a viable long-term strategy. Treatment options range from medications that calm the tremor to, in severe cases, procedures targeting the brain circuits involved.
Anxiety and Functional Tremors
Chronic anxiety keeps your nervous system in a heightened state, and shakiness is one of the physical consequences. This isn’t “imagined.” The adrenaline and cortisol your body produces during sustained stress genuinely increase muscle tension and tremor. For some people, the shakiness itself becomes a source of anxiety, creating a feedback loop.
A separate but related category is functional tremor, previously called psychogenic tremor. This is a real neurological phenomenon where the brain produces involuntary shaking that doesn’t follow the patterns of conditions like essential tremor or Parkinson’s. Functional tremors tend to start suddenly, may change in frequency or rhythm when you’re distracted, and sometimes involve unusual movement patterns that don’t fit neatly into a recognized neurological category. They’re treated differently from other tremors, typically through specialized physical therapy and psychological approaches rather than neurological medications.
When Shakiness Needs Prompt Attention
Most causes of chronic shakiness are manageable and not dangerous, but certain patterns warrant a thorough evaluation sooner rather than later. Be particularly attentive if your tremor started abruptly rather than gradually, if you’re under 50 with no family history of tremor, or if the shakiness comes with other neurological changes like difficulty walking, slurred speech, muscle weakness, or confusion. A tremor that’s only on one side of the body also deserves closer evaluation, since that pattern is more suggestive of Parkinson’s or other conditions affecting one hemisphere of the brain.
A rapid heart rate combined with shakiness and agitation points toward metabolic causes like hyperthyroidism or hypoglycemia that need testing. And if the tremor is getting progressively worse over weeks to months, that trajectory alone is a reason to get it checked out, even if no other symptoms are present.
Figuring Out Your Specific Cause
Because so many different things can cause shakiness, narrowing it down starts with paying attention to patterns. Notice when your tremor is worst. Is it when your hands are resting, or when you’re actively using them? Does it happen after coffee or on an empty stomach? Did it start around the time you began a new medication? Does stress make it dramatically worse? These details matter more than you might think, and they’re exactly what a clinician will ask about.
One simple screening tool doctors use is the spiral drawing test. You draw a tight spiral on paper, and the pattern of wobble can help differentiate between tremor types. Essential tremor tends to produce a consistent, directional wobble along a single axis, while other conditions create more chaotic or unpredictable distortions. Blood work to check thyroid function, blood sugar, and B vitamin levels is typically part of the initial workup as well.
For many people searching this question, the answer turns out to be some combination of caffeine, stress, poor sleep, and possibly a medication side effect. Those causes respond well to straightforward changes. For those with a neurological cause like essential tremor, effective treatments exist. The first step is simply tracking your patterns and getting the right tests done.