Lightning is due to the friction of positive and negative charges between clouds and between clouds and the ground in the atmosphere, resulting in strong discharge, rising temperature, rapid expansion of the atmosphere and deafening noise. This is lightning and thunder.

If the charge becomes strong enough, lightning will happen. When lightning flashes across the sky, it can quickly heat the air along the way. The hot air expands rapidly and impacts the surroundings as violently as an explosion. This caused huge sound waves.

The harm of lightning to human body includes the direct action of current, overpressure or electricity and high temperature. When a person is struck by lightning, the current will pass through the human body quickly. In severe cases, it will lead to heartbeat, respiratory arrest and brain tissue hypoxia and death.

In addition, when lightning strikes, sparks will be generated, which will also cause different degrees of skin burns. Lightning injury can also cause dendritic lightning stripes, epidermal peeling, intradermal bleeding, eardrum or visceral rupture.

Lightning protection devices must be installed in high-rise buildings to prevent lightning disasters. Don't use your mobile phone outdoors. People who have been struck by lightning should be rescued by cardiopulmonary resuscitation immediately. Take as few showers as possible in thunderstorm days, and users of solar water heaters should not take showers.

References:

Baidu encyclopedia entry-lightning