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What causes a body temperature below 35.5℃?

Nov 22, 2024 Source: Cainiu Health
Dr. Yang Ziqi
Introduction
A body temperature below 35.5°C may be caused by measurement errors, environmental factors, dehydration, hypoglycemia, hypothyroidism, etc., and can be managed according to the specific situation. Incorrect methods of temperature measurement may lead to falsely low readings, such as failure to hold the thermometer properly, insufficient measurement time, or inaccurate measurement site.

Body temperature below 35.5°C may be caused by measurement errors, environmental factors, dehydration, hypoglycemia, hypothyroidism, and other conditions, and appropriate measures should be taken according to the specific cause.

1. Measurement error: Incorrect methods of measuring body temperature may lead to falsely low readings, such as failing to hold the thermometer tightly, insufficient measuring time, or inaccurate placement. It is recommended to use the thermometer correctly—when measuring axillary (underarm) temperature, ensure the thermometer is held firmly in place for 5–10 minutes.

2. Environmental factors: Prolonged exposure to cold environments with excessively low ambient temperatures can cause body temperature to drop below 35.5°C, possibly accompanied by shivering, pale and cold skin. It is advised to move quickly to a warm indoor environment, add clothing, drink warm fluids, or use warm baths, electric blankets, or other warming methods to help restore normal body temperature.

3. Dehydration: In a dehydrated state, reduced fluid volume in the body disrupts the balance between heat dissipation and heat retention, impairing the body’s thermoregulatory mechanisms and leading to low body temperature. Symptoms may include thirst, decreased urine output with dark color. Treatment should follow medical advice—mild dehydration can be managed with oral rehydration solutions, while severe cases require intravenous fluid replacement.

4. Hypoglycemia: Low blood glucose levels impair energy supply to the brain and body, damaging the function of the temperature regulation center and resulting in hypothermia. Symptoms may include sweating, tremors, hunger, palpitations, and confusion. Immediate intake of sugary foods or drinks—such as glucose tablets or fruit juice—is recommended.

5. Hypothyroidism: This condition is typically caused by insufficient thyroid hormone, which reduces metabolic rate, decreases heat production, and leads to lower body temperature. Symptoms may include fatigue, weight gain, and dry skin. Under medical supervision, medications such as levothyroxine sodium tablets, thyroid extract tablets, or Yikang capsules may be prescribed to relieve symptoms.

If any discomfort occurs, it is recommended to seek prompt medical attention and follow professional medical advice for treatment.

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