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

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

3. Sinus tachycardia, tachycardia, pulse broadening, pulse pressure widening, circulation time accelerating and cardiac output increasing.

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

5. When anemia is severe, renal function changes, early polyuria, decreased urine specific gravity, increased blood urea nitrogen and proteinuria may occur.

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