Body temperature has been 35.5 ℃ is not normal, in the measurement of body temperature in the three locations often chosen are the oral cavity, armpit, rectum. From the point of view of safety, convenience and hygiene, the armpit is the most commonly chosen location for temperature measurement. There are 3 things you should do before taking your temperature: 1) take your temperature in the early morning, awake, fasting and at rest; 2) wipe the sweat under your armpit with a towel to avoid the evaporation of sweat from affecting the thermometer; 3) keep the thermometer in contact with your armpit for at least 10 minutes to get an accurate temperature. If you do these 3 points, but the body temperature is still lower than 36.0 ℃ is abnormal, you can go to the hospital to do the relevant examination.