heat edema
heat oedema

The balance of salt in the body is also a risk factor for heat edema.

Swelling can also be caused by heat-related problems, such as heat edema from working or being active in a hot environment.

Heat edema (swelling ) in the legs and hands, which can occur when you sit or stand for a long time in a hot environment.

Older adults have an increased risk of heat edema, especially if they have other medical conditions that affect their circulation.

The heat edema usually resolves within several days after the patient becomes acclimated to the warmer environment.

People visiting hot climates from colder climates may also have an increased risk of heat edema.

Heat edema is a cutaneous condition characterized by dependent edema from vasodilatory pooling.

Heat edema presents as a transient swelling of the hands, feet, and ankles and is generally secondary to increased aldosterone secretion, which enhances water retention.

Note that there are other illnesses that can occur when exposed to the heat, such as prickly heat (heat rash) or heat edema (swelling of the arms and legs), but those are not associated with dehydration.