Feeling shaky and dizzy at the same time usually means your brain or muscles aren’t getting something they need, whether that’s sugar, oxygen, stable blood pressure, or calm signaling from your nervous system. These two symptoms overlap in a handful of common conditions, most of them manageable once you identify the trigger.
Low Blood Sugar
This is one of the most common reasons people feel shaky and dizzy simultaneously. When blood sugar drops below 70 mg/dL, your body responds with a cascade of warning signals: shaking, sweating, a pounding heartbeat, blurred vision, and difficulty thinking clearly. Below 54 mg/dL, the situation becomes urgent.
You don’t need to have diabetes for this to happen. Skipping meals, exercising on an empty stomach, or drinking alcohol without eating can all push blood sugar low enough to trigger symptoms. Your brain runs almost entirely on glucose, so when supply drops, dizziness and mental fog set in fast. The shakiness comes from your body releasing stress hormones to mobilize stored sugar, which stimulates your muscles as a side effect.
If you suspect low blood sugar is the cause, eating or drinking something with fast-acting carbohydrates (juice, glucose tablets, a few pieces of candy) typically resolves symptoms within 10 to 15 minutes. If this happens to you repeatedly without an obvious explanation like skipped meals, it’s worth getting checked out.
Anxiety and the Stress Response
Your body’s fight-or-flight system can produce shakiness and dizziness even when there’s no physical danger. When you feel stressed, anxious, or panicked, your adrenal glands flood your bloodstream with adrenaline and noradrenaline. These hormones increase your heart rate, raise blood pressure, and redirect blood flow toward your muscles, heart, and lungs. The result: trembling hands, a racing pulse, and lightheadedness that can feel alarming.
What makes anxiety tricky is the feedback loop. You feel shaky and dizzy, which makes you more anxious, which intensifies the physical symptoms. People in the middle of a panic attack often believe something is seriously wrong with their heart or brain, which only deepens the cycle. Slow, deliberate breathing helps because it signals the nervous system to dial back the adrenaline release. If anxiety-driven shakiness and dizziness happen regularly, therapy focused on managing the stress response (particularly cognitive behavioral therapy) has a strong track record.
Blood Pressure Drops When Standing
If the dizziness and unsteadiness hit specifically when you stand up, orthostatic hypotension is a likely explanation. This happens when your blood pressure falls by 20 mmHg or more (systolic) or 10 mmHg or more (diastolic) upon standing. Gravity pulls blood toward your legs, and your cardiovascular system doesn’t compensate quickly enough to keep your brain fully supplied.
Dehydration is one of the most frequent triggers. When your total blood volume drops, your heart has less fluid to pump, which makes standing up a bigger challenge for your circulatory system. The symptoms are predictable: dizziness, lightheadedness, muscle weakness, and sometimes a shaky or unsteady feeling. Hot weather, not drinking enough water, illness with vomiting or diarrhea, and certain medications (especially blood pressure drugs and diuretics) all increase the risk. Staying well hydrated and standing up slowly are simple fixes that work for many people.
Dehydration on Its Own
Even without a dramatic blood pressure drop, being dehydrated can make you feel shaky and off-balance. Your blood becomes more concentrated and lower in volume, which means less efficient delivery of oxygen and nutrients to your brain and muscles. The signs show up as dizziness when changing positions, muscle cramps, fatigue, and a general sense that something is “off.” Most people underestimate how much fluid they lose through sweat, breathing, and normal metabolism, especially during exercise, hot weather, or illness.
Inner Ear Problems
Your sense of balance depends heavily on a system deep inside each ear. Three tiny semicircular canals, arranged in different dimensions, detect rotation and position changes by tracking the flow of fluid past delicate hair-like sensors. When this system malfunctions, your brain gets conflicting signals about where your body is in space, and the result is dizziness or vertigo (the sensation that the room is spinning).
One of the most common inner ear conditions is BPPV (benign paroxysmal positional vertigo). It happens when tiny calcium carbonate crystals that normally sit in a part of the ear called the utricle break loose and drift into the semicircular canals. As your head moves, these crystals roll around and stimulate the balance sensors inappropriately, triggering intense but brief episodes of vertigo. Turning over in bed, tilting your head back, or bending down are classic triggers. BPPV doesn’t directly cause shakiness, but the disorientation and unsteadiness it produces can make your body tremble in response. A healthcare provider can often resolve BPPV in a single visit using a specific series of head movements that guide the crystals back where they belong.
Anemia
Iron-deficiency anemia reduces the amount of hemoglobin in your red blood cells. Hemoglobin is the molecule that carries oxygen through your bloodstream, so when levels drop, your tissues don’t get the oxygen they need. Your brain is especially sensitive to this. Dizziness, lightheadedness, fatigue, and weakness are hallmark symptoms, and the shakiness comes from muscles struggling to function on reduced oxygen supply.
Anemia develops gradually in most cases, so you might not notice symptoms until it becomes moderate or severe. Heavy menstrual periods, a diet low in iron-rich foods, and chronic blood loss from conditions like ulcers are common causes. A simple blood test can confirm it, and treatment usually involves iron supplementation or dietary changes.
Too Much Caffeine
Caffeine blocks a brain chemical called adenosine that normally promotes calm and drowsiness. In moderate amounts, this creates alertness. In excess, it overstimulates your central nervous system and causes peripheral blood vessels to dilate, leading to jitteriness, trembling, a rapid heartbeat, and dizziness. The threshold varies from person to person. If you’ve recently had more coffee, energy drinks, or pre-workout supplements than usual, caffeine is worth considering as the culprit. Symptoms typically fade as your body metabolizes the caffeine over several hours.
Medications
A wide range of medications can cause dizziness, and several also produce tremors or shakiness. Blood pressure medications, diuretics, anti-seizure drugs, certain antibiotics, pain medications like codeine, acid reflux drugs, anti-inflammatory medications (including prednisone), lithium, and benzodiazepines have all been linked to dizziness or vertigo. If your symptoms started or worsened after beginning a new medication or changing a dose, that connection is worth discussing with whoever prescribed it. Don’t stop a medication on your own, but do flag the timing.
When Shakiness and Dizziness Signal an Emergency
Most causes of shakiness and dizziness are not emergencies, but a few are. Stroke is the most important one to recognize. The American Stroke Association uses the acronym B.E. F.A.S.T. to identify warning signs: sudden loss of Balance, sudden Eye or vision changes, Face drooping on one side, Arm weakness or numbness on one side, Speech difficulty or slurring, and Time to call 911.
Posterior circulation strokes, which affect the back of the brain, are particularly relevant here because they can present with vertigo, imbalance, slurred speech, double vision, nausea, and severe headache. These symptoms can mimic an inner ear problem or a bad bout of dizziness, which makes them easy to dismiss. If dizziness comes on suddenly alongside any one-sided weakness, vision changes, confusion, difficulty speaking, or the worst headache of your life, treat it as an emergency.