Electrical burns require immediate emergency care, even when the skin damage looks minor. Unlike thermal burns from flames or hot surfaces, electricity travels through the body and can destroy muscle, nerves, and blood vessels along its path while leaving the skin relatively intact. That mismatch between what you can see and what’s actually damaged is what makes electrical burns uniquely dangerous and why nearly all of them warrant professional medical evaluation.
Scene Safety Comes First
Before touching someone who has been shocked, make sure the electrical source is no longer active. Turn off the power at the breaker or unplug the device. If that’s not possible, use a non-conducting object like a dry wooden board or rubber-handled tool to separate the person from the source. Touching someone who is still in contact with live current will electrocute you too.
Once the scene is safe, call emergency services. While waiting, check for breathing and a pulse. Electrical injuries can cause the heart to beat irregularly or stop entirely, making CPR a real possibility. If the person fell or was thrown by the shock, treat them as though they have a spinal injury and avoid moving them unnecessarily.
Why the Skin Can Be Misleading
Electrical injuries are classified as low-voltage (under 1,000 volts) or high-voltage (1,000 volts and above). Household current in the United States runs at 120 to 240 volts, so most home accidents fall in the low-voltage category. Power lines, industrial equipment, and lightning are high-voltage sources.
High-voltage current causes deep tissue destruction along its path through the body. It can cook muscle, clot blood vessels, and damage tendons, all while the skin shows only small entry and exit wounds. Entry wounds tend to look small and charred. Exit wounds are often larger and can appear almost explosive. About 90% of these injuries involve the upper extremities, particularly the hands, fingers, and forearms, since people typically grab or touch the source. Feet and lower legs are common exit points.
Low-voltage injuries can still be serious, especially when the current is concentrated on a small area of skin or when contact is prolonged. Alternating current (the type in household outlets) can cause muscles to lock up involuntarily, which means a person may grip the source and be unable to let go, extending the exposure time dramatically.
What Happens Inside the Body
The visible burn is only part of the picture. As electricity travels through tissue, it generates heat proportional to the resistance it encounters. Bones resist current the most, so the tissue closest to bone often sustains the worst thermal damage. Muscles, nerves, and blood vessels, which conduct electricity more readily, are still injured by the energy passing through them.
One of the most dangerous internal consequences is the breakdown of muscle tissue, a condition called rhabdomyolysis. When muscle cells are destroyed, they release a protein called myoglobin into the bloodstream. The kidneys filter myoglobin out, but in high concentrations it overwhelms them and can trigger acute kidney failure. The classic warning signs are muscle pain, weakness, and dark tea-colored urine. This is one of the main reasons electrical burn patients receive aggressive IV fluids in the hospital: the goal is to flush myoglobin through the kidneys before it causes permanent damage.
Swelling in injured limbs can also become life-threatening. Damaged muscles swell inside their surrounding tissue compartments, and because those compartments don’t stretch, pressure builds rapidly. This is called compartment syndrome. The warning signs are severe pain (often out of proportion to what the injury looks like), a feeling of tightness in the limb, numbness or tingling, and weakness. If pressure isn’t relieved surgically, the tissue dies, and amputation may become necessary. High-voltage injuries carry significantly higher rates of compartment syndrome and limb loss.
At the Hospital
Anyone exposed to high-voltage current needs 24 hours of heart monitoring, because electrical injury can cause dangerous heart rhythm abnormalities that may not appear immediately. The same applies to anyone who lost consciousness, has chest pain, or shows an abnormal heart tracing, regardless of the voltage involved.
Fluid replacement is a cornerstone of treatment. For high-voltage electrical burns, doctors target roughly double the urine output they would aim for in a standard thermal burn, typically around 75 to 100 milliliters per hour in adults. This aggressive hydration protects the kidneys from myoglobin damage. Urine is monitored continuously: dark or pigmented urine signals that muscle breakdown products are still circulating and that fluids need to stay high.
Surgeons will assess the full extent of internal damage, which often requires repeated evaluations over several days because tissue can continue to die after the initial injury. If compartment syndrome develops, a procedure to open the tissue compartments and relieve pressure is performed urgently. In severe cases, damaged limbs or tissue that cannot recover may need to be surgically removed.
Arc burns, which occur when electricity jumps across a joint, present their own pattern. The current takes the shortest path across bent joints, so burns commonly appear on the inside of the wrist, the crease of the elbow, and the armpit. These burns can be deep and require specialized wound care or skin grafting.
A Special Risk for Young Children
One of the most common electrical injuries in toddlers involves biting or sucking on electrical cords. These burns typically affect the lips and corners of the mouth, and they carry a specific delayed complication: spontaneous bleeding from the labial artery, usually between four and ten days after the burn. This can be alarming but is usually controlled with direct pressure. Parents of children with oral electrical burns should be aware of this timeline and watch closely during that window.
Long-Term Effects
Electrical injuries frequently leave lasting damage that extends well beyond the initial wound. Permanent nerve injury at the site where the current entered the body is extremely common. Many survivors develop peripheral neuropathy, experiencing chronic numbness, tingling, or loss of function in affected limbs. These nerve injuries may not fully resolve.
Chronic pain is one of the most persistent and difficult complications. Research consistently shows that many electrical injury survivors are never completely relieved of pain regardless of treatment, though the best outcomes come from combining physical treatments with psychological support for the emotional toll of long-term pain.
Vision changes are another concern. Roughly 6% of people who suffer electrical injury develop cataracts within the first year, with additional cases appearing over the following two to three years. This risk generally applies to injuries involving more than 200 volts. Anyone who has sustained a significant electrical burn should have regular eye exams in the years that follow.
What You Can Do Before Help Arrives
After ensuring the scene is safe and calling for emergency help, your options are limited but important. If the person is conscious and breathing, keep them still and calm. Cover visible burns loosely with a clean, dry cloth or sterile bandage. Do not apply ice, butter, ointment, or any home remedy to electrical burns. Do not attempt to remove clothing stuck to burned skin.
If the person is not breathing or has no pulse, begin CPR immediately and continue until paramedics arrive. Electrical injuries are one of the situations where prompt CPR has a genuinely high success rate, because the heart may simply need help restarting a normal rhythm rather than recovering from irreversible damage.
Even if someone feels fine after a low-voltage shock, it is worth getting checked out. Internal injuries, heart rhythm changes, and muscle damage can all be present without obvious symptoms in the first hours. Dark urine, muscle soreness, numbness, or any chest discomfort in the hours or days after an electrical injury are signs that something deeper is going on.