The essential function of breathing for our body
Close link between anemia and breathing
What causes anemia?
Anemia is the result of a lack of red blood cells or hemoglobin in the blood, which can be caused by an iron, folic acid or vitamin B12 deficiency or by bone marrow failure. The key signs of anemia are a pale complexion, fatigue and weakness, an accelerated heart rate and shortness of breath with the slightest effort. Headaches, dizziness, chills and other symptoms may also occur.
Anemia can occur in a number of situations, including dietary deficiencies, particularly in iron or vitamin B12, bone marrow failure, and internal or external bleeding. Many genetic diseases can also cause accelerated destruction (hemolysis) of red blood cells a hemoglobin malfunction.
The impact of anemia on respiratory rhythm
Chronic lung disease and blood oxygenation
Sickle cell anemia and lung problems
Sickle cell anemia, or drepanocytosis, is the form of anemia that can lead to lung complications. In such cases, a relatively common chromosomal mutation is responsible for the production of a particular hemoglobin molecule called “hemoglobin S.” 
Not only does hemoglobin S decrease the amount of hemoglobin available to carry oxygen (anemia), but it also has the property of deforming red blood cells into a sickle shape (sickle cells or drepanocytes). These abnormally shaped red blood cells can then accumulate in small blood vessels and block circulation. In the lungs, this phenomenon is associated not only with increased asthma and sleep apnea attacks in younger individuals, but also with the development of obstructive lung disease in a small percentage of older patients. 
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- Malais Sarkar, Puja Negi Rajta, jasmin Khatana (April 2015). Anemia in Chronic obstructive pulmonary disease: Prevalence, pathogenesis, and potential impact. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4372868/
- Gouvernement du Québec (February 14, 2020). Sickle cell anemia (hemoglobin disorder). https://www.quebec.ca/en/health/health-issues/a-z/sickle-cell-anemia-hemoglobin-disorder
- Dre Anne-Marie Vincent (no publication date). Pulmonary complications of sickle cell disease. https://anemie-falciforme.org/docs/2015/03/5-Ane-Marie-Vincent.pdf