An oxygen deficiency in surrounding tissue is called tissue hypoxia. Commonly, hypoxemia (low oxygen in the blood) leads to hypoxia, as stated by WebMD.
When oxygen is no longer being carried to the tissue, it is known as anoxia, according to the Kansas City University of Medicine & Biosciences. Some of the symptoms of hypoxia include confusion, fast heart rate and changes in the color of the skin. Hypoxia requires treatment by a doctor. This is done by getting more oxygen to the blood through an inhaler or asthma medicine. People with asthma are more likely to suffer from this lack of oxygen.