Lightning feels like a freak event, but it is surprisingly predictable. It strikes the US millions of times a year, peaks on summer afternoons and claims victims who are usually outdoors doing something ordinary — fishing, walking the dog, finishing a round of golf. Knowing what a strike does to the body explains both why it can kill and why most people survive.
A lightning bolt carries an enormous current for a tiny fraction of a second. Because the strike is so short, much of the energy often flashes over the surface of the skin instead of cooking the body from the inside, which is why lightning victims rarely have the massive internal burns seen in high-voltage industrial accidents. The real threat is electrical, not thermal.
Why the heart is the weak point
Your heart and breathing are controlled by electrical signals. A massive pulse of outside current can scramble those signals in an instant. The heart may stop entirely, and the part of the brain that drives breathing can shut down. Here is the important part: the heart sometimes restarts on its own, but breathing often does not. Without help, the lack of oxygen then stops the heart a second time.
That is why survival is closely linked to how quickly someone starts CPR. Victims do not stay "electrified" — touching them is completely safe. If a group of people is struck, the medical advice is to treat first those who look dead, because people who are moving and talking are already breathing.
The injuries survivors live with
About nine out of ten people struck by lightning survive, but many do not walk away unchanged. Common effects include:
- Burns — often in lines or spots where sweat, rain or metal (jewellery, phone, belt buckle) conducted the current.
- Lichtenberg figures — striking fern-like red patterns on the skin that fade within hours or days.
- Ear and eye damage — ruptured eardrums, hearing loss, and cataracts that can appear months later.
- Nerve and brain injury — chronic pain, numbness, sleep disorders, memory and concentration problems, depression and irritability.
Because some of these symptoms are invisible or delayed, survivors are often told they look fine while they struggle for years. Lightning survivor support groups exist for exactly this reason.
Where you are actually safe
Safe shelter means a fully enclosed building with wiring and plumbing, or a hard-topped metal vehicle with the windows up. Picnic shelters, tents, open garages, golf carts and trees do not protect you; trees in particular cause side flashes. Indoors, stay off corded phones and away from plumbing and electrical equipment during the storm, because current can travel through them.
If you are caught outside with no shelter, there is no truly safe option — but moving away from hilltops, open fields, water and tall isolated objects lowers the risk. Do not lie flat on the ground, as that increases your contact with ground current.
