Dehydration is often associated with hot summer weather, but it can be just as common, and just as dangerous, during the winter months. Cold temperatures, dry air, and seasonal illnesses can all contribute to fluid loss, sometimes without people realizing it.
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ConditionsSeasonal Wellness
Jan 31, 2026
Dehydration in Winter: Yes, It Can Still Happen
At Ally Medical Emergency Room, our emergency physicians regularly treat patients with dehydration during winter, especially when symptoms are overlooked or mistaken for other illnesses.
“Many people don’t realize they’re dehydrated in winter because they only attribute dehydration to being out in warm weather. By the time symptoms appear, dehydration may already be affecting the body,” Dr. Jeremy Kenter, Chief Medical Officer, said.
Why Dehydration Can Occur in Winter
Cold weather changes how the body regulates fluids. During winter months:
Thirst signals are reduced
Cold, dry air increases fluid loss through breathing
Heaters dry out indoor air
Seasonal illnesses like flu and stomach viruses cause vomiting, diarrhea, or fever
People may drink less water without realizing it
These factors can lead to dehydration even when temperatures are low.
Common Signs of Dehydration
Dehydration symptoms can range from mild to severe and may include:
Dry mouth or lips
Fatigue or weakness
Dizziness or lightheadedness
Dark-colored urine or decreased urination
Headache
Confusion
Rapid heart rate
Children, older adults, and people with chronic illnesses are especially at risk.
When Dehydration Requires Emergency Care
You should seek emergency care if dehydration is accompanied by:
Persistent vomiting or diarrhea
Inability to keep fluids down
Severe weakness or confusion
Fainting
Rapid breathing or heart rate
Signs of dehydration in infants or young children
Symptoms that worsen despite drinking fluids
“Severe dehydration can affect the heart, kidneys, and brain. Emergency evaluation helps restore fluids safely and prevent complications,” Dr. Jeremy Kenter emphasized.
What to Expect at the ER
At Ally Medical ER, patients with dehydration may receive:
IV fluids to restore hydration
Lab testing to assess electrolyte levels
Medications to treat nausea or underlying illness
Monitoring to ensure safe recovery
Our team works quickly to identify the cause of dehydration and begin appropriate treatment.
Preventing Winter Dehydration
To help reduce the risk of dehydration during winter:
Drink fluids regularly, even if you’re not thirsty
Increase fluid intake during illness
Monitor urine color and frequency
Use a humidifier indoors when possible
While prevention helps, emergency care is essential when symptoms become severe.
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