Most people survive being struck by lightning. About 90% of strike victims live, though many are left with lasting injuries. In the United States, lightning kills an average of 27 people per year, down from a 30-year average of 43, likely because fewer people work outdoors and awareness of lightning safety has improved.
That said, a lightning strike is a serious medical emergency. Whether it kills depends on how the current travels through your body, how quickly you receive help, and a fair amount of luck.
How Lightning Actually Kills
When lightning passes through a person’s body, it can stop the heart and shut down breathing at the same time. The massive electrical surge causes every muscle cell in the heart to fire simultaneously, flatlining it. In many cases, the heart restarts on its own within seconds or minutes thanks to its built-in pacemaker cells. The problem is that the brain’s breathing center often stays paralyzed longer than the heart stays stopped. If breathing doesn’t resume and nobody is there to perform CPR, the heart can stop a second time from oxygen deprivation. This is the sequence that kills most lightning victims.
This is why bystander response matters enormously. A person struck by lightning may look dead, with no pulse and no breath, but CPR can often revive them. There is no residual electrical charge on a strike victim’s body. You will not be shocked by touching them. If multiple people are struck, prioritize anyone who appears unconscious and not breathing, because they’re the ones most likely to die without immediate help and most likely to survive with it.
Five Ways Lightning Strikes People
Not all lightning strikes are the same. How the current reaches you has a major influence on how severe the injuries are.
- Direct strike: You become part of the main discharge channel between cloud and ground. This is the least common type but the most dangerous. It typically happens to people standing in open areas.
- Ground current: Lightning hits a nearby object, and the energy spreads outward through the ground. Because it covers a wide area, ground current causes the most lightning deaths and injuries overall. Anyone standing near a strike point is at risk.
- Side flash: Lightning hits a tall object, like a tree, and part of the current jumps to a person standing within a foot or two. This is why sheltering under a tree during a storm is one of the most dangerous choices you can make.
- Conduction: Current travels through metal wires, plumbing, or other conductive surfaces. This is how most indoor lightning injuries happen. Corded phones, water faucets, anything plugged into an outlet, and even metal window frames can carry the current to you.
- Streamers: As lightning approaches the ground, multiple upward electrical channels rise to meet it. Only one completes the main bolt, but the others discharge energy too. If you’re part of one of those incomplete channels, you can still be injured or killed.
What Lightning Does to the Body
Lightning carries temperatures that can exceed 3,000°C, but a strike lasts only a fraction of a second. Much of the current travels over the outside of the body in what’s called a “flashover,” which is why many survivors don’t have severe burns. The flashover can superheat sweat or moisture on the skin, sometimes blowing apart clothing or shoes. Metal objects you’re wearing or carrying, like jewelry, belt buckles, or phones, can heat up and cause localized burns.
When current does travel internally, the damage can be far more severe. It can rupture small blood vessels throughout organs, fracture bones, and cause areas of tissue destruction in solid organs like the liver or kidneys. The amount of internal damage depends largely on the path the current takes and how much of it enters the body versus traveling over the surface.
One distinctive mark of a lightning strike is a branching, fern-like pattern on the skin known as a Lichtenberg figure. These aren’t true burns. They form when the electrical discharge damages tiny blood vessels in the skin, causing red blood cells to leak into surrounding tissue in a tree-like pattern. They typically fade completely within 24 hours.
Temporary Paralysis After a Strike
Some survivors experience a frightening condition called keraunoparalysis: sudden, temporary paralysis, usually in the legs. The limbs go pale and cold, with loss of sensation. This happens because the strike triggers an intense surge of stress hormones that cause blood vessels supplying the spinal cord and limbs to clamp down. It generally reverses on its own within hours, though full recovery can take a couple of days. One documented case involved a 50-year-old man who couldn’t move his legs after a strike but was walking again within three days.
Long-Term Effects for Survivors
Surviving the initial strike is only part of the story. The 90% who live often face a long road of recovery. Lightning can cause significant damage to the brain and nervous system, and many survivors deal with problems that persist for months or years. Memory loss, difficulty concentrating, sleep disorders, chronic pain, personality changes, and depression are all common. Some of these neurobehavioral symptoms are subtle enough that they go unrecognized at first, only becoming apparent weeks after the injury.
Two of the most serious long-term complications involve direct damage to the brain and spinal cord, which can cause permanent cognitive impairment or weakness in the limbs. Many survivors require extended neurological rehabilitation. The combination of invisible symptoms and a dramatic origin story can make it difficult for survivors to get the ongoing care they need, especially once the acute emergency has passed.
How to Reduce Your Risk
The simplest rule: when you hear thunder, go inside. Lightning can strike up to 10 miles from the center of a storm, well beyond where rain is falling. A substantial building or a hard-topped vehicle with the windows closed are the only reliably safe shelters. Open structures like gazebos, porches, and picnic shelters offer no protection.
Once inside, stay away from anything that conducts electricity. Don’t shower, wash dishes, or use corded electronics during a thunderstorm. Wait at least 30 minutes after the last clap of thunder before going back outside. Many lightning deaths happen because people return to outdoor activities too soon, during what feels like the tail end of a storm.
If you’re caught outside with no shelter available, avoid open fields, hilltops, isolated trees, and bodies of water. Crouch low with your feet together to minimize contact with the ground, since ground current is the most common way lightning injures people. Being near a group of shorter trees is safer than standing in the open, but no outdoor location is truly safe during an active thunderstorm.