Can hypothermia cause someone to faint?

Yes it could. There are various side effects of Hypothermia. Here's a very good article I have read check: Therapeutic Hypothermia Side Effects. read more

In severe hypothermia the body will shut down in order to preserve its function. Part of this process involves passing out. If hypothermia gets to this point the patient should be gradually rewarmed and IMMEDIATE medical attention should be sought. read more

However, much milder environments can also lead to hypothermia, depending on a person's age, body mass, body fat, overall health, and length of time exposed to cold temperatures. A frail, older adult in a 60-degree house after a power outage can develop mild hypothermia overnight. read more

Cold weather is the primary cause of hypothermia. When your body experiences extremely cold temperatures, it loses heat more quickly than it can produce it. Staying in cold water too long can also cause these effects. read more