How to Stop Shaking From an Epidural and Why It Happens

Shaking during or after an epidural is one of the most common side effects of the procedure, occurring in roughly half of all patients who receive one. The trembling can range from mild teeth chattering to full-body shudders that feel alarming, especially during labor. The primary culprit is a sudden shift in how your body distributes heat, though the full picture turns out to be more complicated than simple temperature drop. The good news: several effective strategies exist, from warm blankets to specific medications your anesthesiologist can administer within minutes.

Why Epidurals Make You Shake

Your body normally keeps its core temperature stable by tightly controlling blood flow. Blood vessels in your arms and legs stay slightly constricted, keeping warmth concentrated in your chest and abdomen. An epidural disrupts this system by blocking the nerve signals that maintain that constriction. With those signals turned off below the level of the block, blood vessels in your lower body dilate, and warm blood from your core rushes outward into cooler peripheral tissues. Your core temperature drops as a result.¹

This internal heat redistribution is the biggest factor in the first hour or so after the epidural takes effect. On top of that, you also lose heat to the environment, since your dilated blood vessels are now radiating warmth from a larger surface area. Research has confirmed that both mechanisms contribute: the core-to-peripheral shuffle and plain heat loss to the surrounding air.²

Once your core temperature dips below a certain threshold, your brain activates shivering as a defense mechanism, essentially ordering your muscles to contract rapidly to generate heat. Interestingly, the epidural also blocks some of the cold-sensing nerve signals from your skin, which is why shivering during an epidural is often less intense than what you would experience from the same temperature drop without anesthesia. In some people, the onset of shivering is also delayed for this reason.³

When Shaking Happens Without a Temperature Drop

If you have experienced violent shaking that started almost immediately after the epidural top-up dose, before your body had time to lose meaningful heat, you are not imagining it. Research on women undergoing cesarean delivery found that tremor often began when core temperature had not actually changed. In that study, core temperature before the epidural top-up averaged about 37.6°C and did not drop between the dose and the onset of shaking. Meanwhile, skin temperature actually went up, which is the opposite of what you would expect if simple cold were the trigger.⁴

This means that not all epidural-related shaking is classic thermoregulatory shivering. A separate study during labor found shivering-like tremor in about 18% of observation periods before delivery, and during a substantial fraction of those episodes the patients were both normally warm and vasodilated. After delivery, about 28% of shivering episodes were classified as non-thermoregulatory.⁵

Researchers suspect several explanations for this non-thermal tremor. One involves the epidural solution itself stimulating temperature-sensitive nerve tissue inside the spinal canal. A study of 30 women who received cold bupivacaine at 4°C found that 47% developed shivering. When eight of the worst shivers were given a second injection warmed to 41°C, half of them stopped shaking entirely, suggesting the temperature of the fluid touching the spinal canal plays its own role independent of overall body heat.⁶ Anxiety, the sudden hormonal shifts of labor, and the psychological stress of surgery may also play into it, though these are harder to measure directly.

How Common Shaking Really Is

Very common. A review spanning 21 studies found that the median incidence of shivering during neuraxial anesthesia (a category that includes both epidurals and spinal blocks) was about 55% among control groups receiving no anti-shivering treatment.⁷ If you’re shaking after your epidural, you’re in the majority, not the minority. The incidence is roughly the same whether you receive an epidural or a spinal block; research on volunteers showed that the shivering thresholds during both techniques were virtually identical.⁸

One modifiable risk factor is the temperature of the anesthetic solution itself. In a study of 40 women scheduled for cesarean section, 45% of those who received cold bupivacaine (stored at 4°C) developed shivering, compared to only 10% of those who received bupivacaine warmed to body temperature. That difference was statistically meaningful.⁹ Many hospitals now routinely warm epidural solutions before injection, though this isn’t universal.

Medications That Can Stop or Prevent It

If shaking becomes severe, your anesthesiologist has several drugs that can help. Each works through a different mechanism, and the choice often depends on the clinical situation.

• Meperidine (pethidine): Long considered the gold standard for treating post-epidural shivering. It works through kappa-opioid receptors, a pathway distinct from the mu-opioid receptors responsible for pain relief. Low doses given intravenously can stop shaking within minutes. The main downside is that it can cause nausea and mild sedation.
• Dexmedetomidine: A sedative that controlled shivering in 100% of patients in one trial, with an average time to effect of just over two minutes. By comparison, clonidine, a related drug, worked in 80% of patients and took about five and a half minutes. Dexmedetomidine also had no recurrence, while about a quarter of clonidine patients had shivering return.¹⁰
• Ondansetron: Better known as an anti-nausea drug, ondansetron has shown promise as a preventive measure. One trial found that only 10% of patients who received ondansetron before spinal anesthesia developed severe shivering, compared to about 43% of those who received a placebo.¹¹ However, it may be less effective than newer alternatives.
• Nefopam: A non-opioid painkiller that appears to outperform ondansetron for shivering prevention. In a head-to-head trial, 16% of patients given nefopam developed shivering versus about 24% with ondansetron.¹²

Your anesthesiologist will factor in your overall condition, whether you’re in labor, and what other medications you’re already receiving when choosing which drug to use. In a labor epidural setting, meperidine in small intravenous doses remains one of the most commonly used treatments, partly because it’s been studied for decades and partly because it acts fast.

The Role of Fentanyl in Your Epidural Mix

Many labor epidurals already contain fentanyl mixed with the local anesthetic. This creates an interesting trade-off when it comes to shivering. On one hand, adding fentanyl to the epidural solution has been shown to cut the overall incidence of shivering by about half.¹³ On the other hand, fentanyl lowers your shivering threshold, meaning your body won’t start generating heat through shivering until your core temperature has fallen further than it otherwise would. The net result is that while you may shake less, you can also lose more heat before your body mounts a defense.¹⁴

In practical terms, this means you might feel surprisingly cold without visibly shaking, because the opioid has suppressed the shivering response itself while still allowing heat loss to continue. This is one reason anesthesia teams monitor temperature rather than relying on shivering as a proxy for warmth. If you’re not shivering but feel very cold, mention it. Your team can address the temperature drop directly with warming measures even if you’re not trembling.

What You and Your Care Team Can Do Without Drugs

Warming is the most straightforward non-drug intervention, and it works on the basic physics of the problem. Forced-air warming blankets, the kind that blow warm air through a perforated quilt draped over your upper body, are the standard tool in most operating rooms and many labor suites. In research on patients receiving epidurals combined with general anesthesia, prewarming for even 10 minutes before induction helped counter the temperature redistribution that follows the block.¹⁵

Beyond forced-air blankets, some simpler strategies help:

• Warm IV fluids: Many facilities now run intravenous fluids through a warmer before they reach your vein, reducing the cooling effect of room-temperature saline entering your bloodstream.
• Extra blankets and socks: Covering your upper body and extremities limits radiant heat loss from the areas the epidural hasn’t blocked. Warm socks on your feet can make a surprising difference in comfort, even if the epidural has numbed them, because your feet still radiate heat.
• Keeping the room warm: Operating rooms are notoriously cold, often kept at 18–21°C for infection-control reasons. If you’re in a labor room rather than an OR, ask for the thermostat to be turned up.
• Prewarming: If your epidural is being placed in a planned setting (such as a scheduled cesarean), ask whether a warming blanket can be applied for a few minutes beforehand. Building up a slight heat reserve before the block takes effect helps buffer against the redistribution that follows.

These measures are additive. Any single one helps a little; combining several of them tackles the problem from multiple angles.

Is the Shaking Dangerous

For most people, epidural shivering is uncomfortable and alarming but not harmful. However, it does put real physiological stress on the body. Intense shivering increases oxygen consumption, raises heart rate, and can drive up blood pressure. For someone with significant heart disease or compromised oxygen delivery, this extra metabolic demand can be meaningful. During labor, severe shaking can interfere with blood pressure monitoring, pulse oximetry readings, and even fetal heart-rate tracings, making the clinical team’s job harder.⁷

For the baby, shaking itself is not directly harmful. The concern is more indirect: if shivering signals genuine hypothermia in the mother, prolonged low core temperature could theoretically affect uterine blood flow. In practice, anesthesia teams treat both the shivering and the underlying temperature drop, so the risk to the baby from this mechanism alone is very small. Most people find the worst part is simply the sensation: the loss of control over your own body at a moment that’s already emotionally charged.

When Shaking Might Point to Something Else

One complication that overlaps with shivering is epidural-related maternal fever, a genuine rise in core temperature that can develop during prolonged labor with an epidural in place. This is not the same as the cooling and shivering discussed above; it’s an inflammatory response whose exact mechanism is still debated. The clinical problem is that a fever during labor can look identical to an infection like chorioamnionitis, and there is currently no reliable way to distinguish the two at the bedside.¹⁶

If you develop both shaking and a rising temperature during labor, your team will likely treat it as a potential infection out of caution, which can mean antibiotics and sometimes a faster delivery timeline. It’s worth knowing that the fever may be epidural-related rather than infectious, but the prudent medical response is the same either way. This is one reason labor teams monitor temperature regularly after an epidural is placed, not just to track hypothermia risk but to catch unexplained fever early.

What to Tell Your Anesthesiologist

Communication makes a real difference. Before the epidural, mention if you tend to run cold, if the room feels chilly, or if you’re anxious about shaking (having experienced it in a prior labor, for instance). During the epidural, speak up as soon as you feel trembling begin. Early treatment, whether with a warm blanket or a small dose of medication, is more effective than waiting until the shaking has become severe and your core temperature has dropped further.

If you’ve had a previous epidural and shivered badly, it’s reasonable to ask about prophylactic measures: a warmed epidural solution, a prewarming blanket, or even a preventive dose of ondansetron. Not every facility will offer all of these, but asking opens the conversation. Anesthesiologists deal with shivering constantly and generally have a preferred protocol ready to go. The main thing you can do from your side is not assume the shaking is something you just have to endure. It’s one of the most treatable side effects of the procedure, and your team would rather intervene early than watch you suffer through it.

Epidural Shivering After Delivery and in Non-Obstetric Settings

Most of the research on epidural shaking focuses on labor and cesarean delivery, but the phenomenon is not unique to obstetrics. Anyone receiving an epidural for surgery, whether it’s a knee replacement, a hernia repair, or abdominal surgery, can experience the same shivering through the same mechanisms. The heat redistribution physics don’t change based on the reason for the block. What does change is the clinical context: in a non-obstetric operating room, forced-air warming is almost always running from the start, and the anesthesia team can use a wider range of medications without worrying about effects on a fetus.

After delivery, shivering tends to resolve on its own as the epidural wears off and your body regains the ability to constrict blood vessels and conserve heat. Most women stop shaking within 20 to 30 minutes of the block receding, though it can linger longer if the room is cold or if you’ve lost significant heat. Warm blankets and skin-to-skin contact with your baby (which also warms the newborn) can speed recovery. If the shaking persists well beyond the epidural wearing off, or if it’s accompanied by fever and chills, let your nurse know so they can rule out other causes.