Last time I went to donate blood, the blood collection center sent me a text message saying that my blood did not meet the requirements for blood donation. Does it indicate any problems (diseases)?

The standard of health is different from the standard of blood donation, and the requirements for blood donation are higher. Blood routine examination is a routine examination. You can only see if your white blood cells are abnormal, and then you can estimate whether you have infection or inflammation. I suggest you call the blood station first and ask what indicators of your blood are wrong, and then go to the hospital for examination.