What causes low oxygen level in the blood?

Many things... Many things can cause a low oxygen level in the blood: so many, in fact, that i don't have enough room here to name them all. Here are some common causes: pneumonia; heart failure; clots to the lungs; emphysema; asthma. Hope this helps...

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Please tell me what can cause low oxygen level in the blood?

Hypoxia. Anything that decreases o2 diffusibility or increases o2 consumption. These will include copd, pulmonary fibrosis and interstitial lung diseases, asthma exacerbation due to decreased lung volume same as in lung resection, pe, later part of chf, sepsis. Read more...