1. Pale skin and mucous membrane, fatigue, fatigue, dizziness, tinnitus, memory loss, inattention, etc.

2. A little activity or emotional excitement means shortness of breath.

3. Sinus tachycardia, tachycardia, pulse enrichment, pulse pressure widening, accelerated circulation time and increased cardiac output.

4. Loss of appetite, nausea, vomiting, abdominal distension and even diarrhea, and some patients have obvious glossitis.

5. Changes in renal function, early polyuria, decreased urine proportion and increased blood urea nitrogen, and proteinuria may occur when anemia is severe.

6. Menstrual disorders (amenorrhea) and decreased libido are also quite common.