If your heart is beating/palpitating fast, it might be a sign of Iron deficiency Anemia. Due to low hemoglobin the heart has to work harder to carry oxygen which might make the heartbeat fast.
When the hemoglobin is low, the heart works harder to carry oxygen to the brain, and low oxygen in the brain causes the blood vessels to swell causing headaches.
Due to anemia, low oxygen levels and hemoglobin, the heart is not able to get anything properly leading to heart failure.
People with anemia have poor circulation of blood which results in icy cold hands and feets.
Due to low oxygen levels in the body, the blood cells are not able to break down the nutrients and convert them into energy, making us feel exhausted.
When the iron level is low in the body the lungs overcompensate itself to collect oxygen leading to shortness of breath.
Due to Anemia, we can develop many strange cravings such as wanting to eat dirt, ice, paper or clay.