About 90% of people struck by lightning survive, according to the National Weather Service. But survival doesn’t mean walking away unharmed. Lightning carries enough voltage to disrupt your heart rhythm, temporarily paralyze your limbs, burn your skin, damage your hearing and vision, and leave lasting neurological and psychological effects. What actually happens depends on how the lightning reaches you, how long the current travels through your body, and which organs are in its path.
How Lightning Actually Reaches You
Most people picture a bolt hitting someone directly on the head, but that’s actually the rarest scenario, accounting for only about 5% of lightning injuries. The most common way people are hurt is through ground current, which causes roughly half of all lightning injuries. This happens when lightning strikes the ground or an object nearby and the electrical current spreads outward through the earth, passing through your body on its way.
About one-third of injuries come from side splash, where lightning strikes a nearby object (a tree, a pole, another person) and the current jumps to you because your body offers an easier path. This is why sheltering under a tall tree during a storm is one of the most dangerous things you can do.
What Happens to Your Heart
The most immediately life-threatening effect of a lightning strike is cardiac arrest. Lightning delivers a massive direct current shock that can depolarize the entire heart muscle at once, essentially short-circuiting its electrical system. The body also floods with stress hormones in response, compounding the disruption to heart rate and rhythm.
In one large case series, ventricular fibrillation (a chaotic, ineffective quivering of the heart) was the first recorded rhythm in half of victims whose heart data were available. Other victims showed complete cardiac standstill. Less dangerous rhythm disturbances like atrial fibrillation can also occur and typically resolve within days. Some survivors develop prolonged changes in their heart’s electrical patterns that require monitoring even after the initial crisis passes. Lightning can also bruise the heart muscle, damage the aorta, and cause fluid buildup around the heart.
Temporary Paralysis and Nerve Damage
One of the stranger effects of a lightning strike is keraunoparalysis, a temporary paralysis that typically affects the legs. Victims can lose all feeling and movement in their lower limbs immediately after being struck. In one documented case, a 23-year-old man was completely paralyzed from the waist down with total sensory loss, yet his leg function returned significantly within 48 hours. This condition generally resolves within hours to days, though recognizing it is important so that doctors don’t rush into unnecessary surgery thinking the spinal cord has been permanently damaged.
Not all nerve damage is temporary. Lightning can injure both the central nervous system (brain and spinal cord) and peripheral nerves throughout the body. Patients with spinal cord damage are more likely to face permanent paralysis. Severe muscle contractions during the strike can also cause muscle tissue to break down, which in turn can stress the kidneys.
Burns and Lichtenberg Figures
Lightning burns range from superficial to deep, depending on the path the current takes. But the most distinctive skin marking is something called a Lichtenberg figure: a fern-like or branching pattern that appears on the skin, usually within an hour of the strike. These figures aren’t actually burns. They likely result from damage to tiny blood vessels near the skin’s surface, causing leakage that creates the pattern. They tend to show up on moist skin and fade within 48 hours. They’re painless and unique to lightning exposure.
Damage to Eyes and Ears
Lightning frequently damages hearing and vision, sometimes immediately and sometimes with a delay of weeks or months. The explosive shockwave can rupture eardrums and cause both conductive hearing loss (from physical damage to the ear structures) and sensorineural hearing loss (from nerve damage). In some cases, the hearing loss is permanent.
Eye damage can be equally severe. Cataracts are a well-documented long-term consequence, sometimes developing months after the strike. One case study documented a patient who, a year after being struck, had developed cataracts in both eyes along with corneal scarring, severe dry eye, and healed inflammation inside the eye. His vision had deteriorated to the point where he could only count fingers held in front of him. Vertigo is another common complaint, likely tied to damage in the inner ear.
Long-Term Neurological and Psychological Effects
The 90% survival rate can be misleading, because many survivors live with significant long-term disabilities. Decreased cognitive function is one of the most commonly reported problems. Survivors frequently describe difficulty with memory, concentration, and processing speed. Chronic pain syndromes are also common, sometimes persisting for years.
The psychological toll can be just as disabling. Depression, post-traumatic stress disorder, and significant personality changes appear frequently in follow-up studies of lightning survivors. Many experience major disruptions to their work and social lives. Research suggests these neuropsychiatric changes can be persistent and occasionally progressive, meaning they worsen over time rather than improve. Individual coping patterns and pre-existing emotional health seem to influence how severe the psychological aftermath becomes, but even previously healthy individuals can develop lasting problems.
What to Do If Someone Is Struck
A person struck by lightning carries no residual electrical charge. You can touch them safely, and you should act immediately. Call emergency services first, then begin CPR if the person has no pulse or isn’t breathing. A lightning victim who appears dead can often be revived if CPR starts quickly enough. If multiple people have been struck, prioritize those who are unconscious, since conscious victims are already showing signs of survival.
Common injuries you might see include burns, open wounds, and fractures (from the force of the strike or from being thrown). Keep the person still and treat visible injuries as best you can while waiting for paramedics. The speed of initial resuscitation is the single biggest factor in whether a cardiac arrest victim survives with good neurological function.