If you or someone near you just received an electric shock, the first priority is making sure the person is no longer in contact with the electrical source. Even a shock that feels minor can cause internal damage that isn’t visible on the skin, so understanding what to do in the minutes and hours afterward matters.
Make the Scene Safe First
Do not touch the person being shocked or anything they’re in contact with. Electricity can pass through their body into yours. Turn off the power source if you can reach the breaker, unplug the device, or flip the switch safely. If you can’t cut the power, use something non-conductive to separate the person from the electrical source. Dry wood, plastic, or cardboard all work. A wooden broom handle, a plastic chair, or a folded cardboard box can break the contact without putting you at risk.
Once the person is free from the current, check whether they’re conscious and breathing. If they’re unresponsive or not breathing, call emergency services immediately and begin CPR if you’re trained. Even if the person seems fine, any shock beyond a brief static-like zap warrants medical evaluation.
Why Every Electrical Injury Needs Medical Attention
Electrical burns are deceptive. You might see a small mark where the current entered the skin, but the real damage often runs along the path the electricity took through the body, injuring muscles, blood vessels, and nerves deep inside an arm or leg. The Mayo Clinic notes that the internal damage from an electrical injury is frequently worse than what appears on the surface.
One serious hidden risk is muscle breakdown. When electricity damages skeletal muscle, the damaged cells release their contents into the bloodstream. This condition, called rhabdomyolysis, affects up to 10% of people who survive a significant electrical accident. The protein released from destroyed muscle cells is toxic to the kidneys, and about a third of people who develop this complication go on to have acute kidney injury in the days that follow. You won’t necessarily feel this happening. Dark or tea-colored urine is one warning sign, but blood tests in the emergency department are the reliable way to catch it early.
Heart Rhythm Problems Can Be Delayed
Electricity passing through the chest can disrupt the heart’s electrical system. Sometimes this happens immediately, but dangerous heart rhythm problems can also show up hours or even days later. In one documented case, a 24-year-old man touched a household-voltage switch and initially showed only mild abnormalities on his heart tracing. Over the next day, his heart’s conduction system progressively deteriorated until he went into a life-threatening rhythm that required emergency defibrillation. In another case, an electrician exposed to high voltage collapsed 12 hours later while playing football.
The reassuring finding from emergency medicine research is that if your initial heart tracing (ECG) is completely normal and you have no symptoms, the risk of a delayed cardiac event is very low. That’s exactly why getting checked matters: a normal ECG gives you and your doctor confidence that your heart wasn’t affected. An abnormal one means you need monitoring.
How Current Levels Affect the Body
The severity of an electric shock depends less on voltage and more on how much current flows through your body and what path it takes. At around 16 milliamps, the muscles in your hand contract so forcefully that you can’t release your grip on the source. At 20 milliamps, the muscles that control breathing can become paralyzed. At 100 milliamps, the heart can go into fibrillation, a chaotic rhythm that stops effective blood flow. Household current is more than capable of delivering these levels under the right conditions, which is why even 120-volt shocks can be fatal.
The path the current travels matters enormously. A shock that enters one hand and exits through the other crosses the chest, putting the heart directly in the current’s path. A shock confined to one finger may cause a local burn but poses far less cardiac risk.
Caring for Electrical Burns
For a minor electrical skin burn (small, superficial, no numbness or deep tissue damage), place a cool, wet cloth on the area, gently clean the skin, and cover it with a bandage. This is basic wound care, similar to a small thermal burn.
For serious burns, the approach is different. Cover burned areas with sterile gauze or a clean cloth while waiting for emergency help. Don’t remove clothing stuck to the burn, don’t try to clean deep wounds yourself, and avoid covering the person with a blanket or towel because loose fibers can embed in burned tissue and complicate treatment. Do not move the person unless they’re in immediate danger from the environment.
Symptoms to Watch for Afterward
Even after you’ve been evaluated and sent home, pay attention to your body over the following days and weeks. Reasons to return for medical care include:
- Chest pain or palpitations, which could signal a delayed heart rhythm disturbance
- Dark or reduced urine output, a sign of possible kidney stress from muscle breakdown
- Numbness, tingling, or weakness in the limbs the current passed through
- Increasing pain or swelling at or near the injury site, suggesting deeper tissue damage
- Confusion, memory problems, or difficulty concentrating
Long-Term Effects Are Possible
A large register-based study found that people who survived electrical injuries had a higher risk of several neurological problems in the years that followed. These included epilepsy, abnormal involuntary movements, chronic headaches, migraines, vertigo, and nerve damage causing numbness or pain in the arms or legs. Most of these conditions were diagnosed within six months of the injury, but some appeared up to five years later.
This doesn’t mean every person who gets shocked will develop neurological symptoms. But it does mean that if you notice new headaches, tingling, unusual movements, or balance problems in the months after an electrical injury, the shock is a plausible cause worth mentioning to your doctor. Connecting those dots early can lead to faster treatment.