The answer to 'termite swarms' is that termite swarms are a clear sign of an active termite infestation in your home. Termites swarm, or disperse, in the spring to start new colonies. Seeing termite swarms means there is likely an established colony in or around your home that needs to be treated.
Common causes of termite swarms include warm, humid weather, which triggers the termites to leave their nest and find a new place to start a colony. Signs of a termite swarm include seeing winged insects around your home, especially near windows and doors. If you see a termite swarm, it's important to take action quickly to prevent further damage to your home.