1. There was an error in the first inspection result, which may be caused by improper operation and instrument failure during the inspection. In the second inspection, whether the operation is more standardized or the instrument is more accurate, the results are different.
2. The results of the first examination may be influenced by some accidental factors, such as diet and rest before the examination. In the second inspection, these factors may be better controlled, thus obtaining different results.
3. The results of the first examination may be misdiagnosed or missed, such as the negligence of inspectors or the early stage of the disease. At the second examination, the condition had developed to a more obvious stage, and different results were obtained.
It should be noted that the health certificate is only a preliminary physical examination certificate, and its results only represent good physical condition at the time of examination, not complete health. If you feel unwell, you should seek medical advice promptly.