The symptoms of low hematocrit are anaemia, and there are no obvious symptoms in patients with mild anaemia, but in patients with moderate anaemia and severe anaemia, the symptoms are more obvious. 1. Symptoms of decreased motor function, such as weakness of the limbs, and the need to sit down and rest after light activity. 4. symptoms of respiratory and circulatory function, such as shortness of breath, panic and chest tightness, which are not obvious in a quiet state, but will occur after light activity, such as panic and chest tightness, and the need to stop and gasp for breath.