What wold be the consequences of a deficiency of haemoglobin in our bodies?

Haemoglobin picks up oxygen from lungs to form oxyhaemoglobin and delivers it to the body tissues. Its deficiency in our bodies will lead to anaemia. This is because the body cells will not receive sufficient oxygen due to deficiency of haemoglobin and thus the body will suffer with anaemia, facing nausea, dizziness, headache, fatigue etc.