Haemoglobin refers to a substance found in the bloodstream of mammals. It transports oxygen to the bloodstream. It is very important to have the right level of haemoglobin the blood. The low levels of haemoglobin in the blood can cause many problems in the body. You may suffer from anaemia and other diseases. Many pregnant women suffer from haemoglobin which may affect the birth of the child. It affects the physicality of the person. Old people quite often become victims of low haemoglobin in the blood. A low level of haemoglobin in the blood makes you unable to walk for a longer time and climb stairs. You cannot lift any heavy weights either.