Side effects of drinking cold water in summer: What you need to know

On a scorching summer day, reaching for a glass of ice-cold water may feel like the ultimate refreshment. 

While cold water can offer temporary relief from the heat, excessive consumption—especially during or after meals—can come with unintended side effects. 

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Understanding how cold water affects your body can help you make healthier hydration choices.

1. Digestive Disruption: Cold water can constrict blood vessels and slow down the digestive process. It may solidify fats from the foods you’ve eaten, making digestion more difficult. This can lead to bloating, indigestion, and stomach discomfort, particularly if consumed during or right after meals.

2. Throat Irritation: Sudden exposure to icy drinks can irritate the throat lining, potentially leading to soreness, a mild cough, or even triggering cold-like symptoms in sensitive individuals. People prone to respiratory issues should be cautious.

3. Reduced Heart Rate: Cold water can stimulate the vagus nerve—a key part of the nervous system—resulting in a temporary drop in heart rate. While usually harmless, it can cause dizziness or lightheadedness in some individuals.

4. Decreased Hydration Efficiency: Although cold water quenches thirst quickly, it may not be as effective at hydrating the body as water closer to body temperature. The body must expend energy to warm cold water, slightly delaying the hydration process.

5. Trigger for Migraines or Headaches: In some people, especially those who are prone to migraines, drinking ice-cold water or beverages may trigger sudden headaches or brain freeze—a sharp, stabbing pain in the forehead.

6. Aggravation of Pre-Existing Conditions: For those with sinus problems, asthma, or sore throats, drinking cold water can worsen symptoms. Cold water may increase mucus production or narrow airways in sensitive individuals.

Best Practices for Hydration in Summer:

• Opt for cool or room temperature water, especially around mealtime.

• Infuse water with natural flavors like mint, lemon, or cucumber for a refreshing yet gentle drink.

• Stay consistent with water intake throughout the day rather than gulping large amounts in one sitting.

• Avoid icy water post-exercise, when your body is warm and may react negatively to sudden cold.

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While sipping cold water in summer feels satisfying, it’s important to be mindful of how it affects your body. Moderation is key—occasionally enjoying a cool drink is fine, but relying heavily on ice-cold water may lead to digestive or respiratory discomfort. Choose wisely for better hydration and overall well-being.