Body temperature of 35.8°C is not normal.
The normal range of human underarm temperature is 36.0°C to 37.2°C, so 35.8°C is not within the normal range and is considered hypothermia.
Hypothermia may be caused by a variety of reasons, such as cold, anemia, hypothyroidism and so on.
If you have a low body temperature, you should first clarify whether the thermometer is normal or not, and then you can keep warm or eat to raise your body temperature. If your body temperature does not rise, or if you have a cold sweat, trembling, low blood pressure, drowsiness and other discomforts, you should go to the hospital immediately to improve the blood test, thyroid function test and other auxiliary tests in order to clarify your condition.
In normal life, you should increase or decrease clothing according to the temperature, avoid being in a cold state, and insist on exercise, balanced diet, improve physical fitness, and control the body temperature in the normal range.