Doctor, I shared a seat with my mother on the bus today. There were a lot of people on the bus ~ because it was a little crowded, my mother leaned against me, and I felt it soon.

This situation is probably due to anemia.

The following is an introduction to anemia:

Anemia refers to a common clinical symptom that the volume of human peripheral red blood cells drops below the lower limit of the normal range. Because the measurement of red blood cell volume is complicated, it is often replaced by hemoglobin (Hb) concentration in clinic. Hematologists in China believe that adult male hemoglobin

According to the diagnostic criteria formulated by WHO in 1972, anemia is diagnosed when hemoglobin is below the sea level: 6 months to.

It should be noted that the normal value of hemoglobin of residents living in plateau area for a long time is higher than that of residents living at sea level; In pregnancy, hypoproteinemia, congestive heart failure, splenomegaly and macroglobulinemia, the plasma volume increases, and even if the red blood cell volume is normal, the hemoglobin concentration decreases due to blood dilution, which is easy to be misdiagnosed as anemia; When the circulating blood volume decreases due to dehydration or acute massive blood loss, anemia is easily missed due to the increase of hemoglobin concentration, even if the red blood cell volume is low due to blood concentration.

Refer to Baidu Encyclopedia-Anemia for the above information.