hyperthermia is when the body temp. rises to high and hypothermia is when it get to low

The suffix -thermia means having to do with heat.:)

Hypothermia.

Hypo - ancient Greek meaning 'under'

Hyper - above, excessive, more

Thermia - tempreture

Hyperpyrexia is a body temp over 105.8 °F/41 °C

It has a medicine called Chloroplastic Thermia

Indoors ... no.

Outdoors ... depends on the water temperature and the outside temperature. Hypo-thermia can set in if conditions are too chilly.