My sister has low haemoglobin for the last few years. Around 2011, she got unconcious for a few seconds and we found that her haemoglobin was around 7. Doc gave her sone iron medication and she felt fine. Next time, haemoglobin was aroind 6-7 again when
pregnant. Now its been 7 months since then and now her haemoglobin is again around 7. I'm really worried what could be causing it and its harm in long term.