As a medical professional with expertise in respiratory health, I can provide insight into the signs and symptoms of hypoxia. The first sign of hypoxia can vary depending on the individual and the severity of the condition. However, one of the earliest indicators is often tachycardia, which is an abnormally rapid heart rate. This is a physiological response as the body attempts to increase oxygen delivery to the tissues. Another early sign can be confusion or disorientation, which may manifest as behavioral changes or difficulty concentrating. As hypoxia progresses, other symptoms such as cyanosis (a bluish tint to the skin and mucous membranes due to low oxygen levels), difficulty breathing (dyspnea), and pallor (paleness of the skin) may become apparent. read more >>

In severe hypoxia, or hypoxia of very rapid onset, ataxia, confusion / disorientation / hallucinations / behavioral change, severe headaches / reduced level of consciousness, papilloedema, breathlessness, pallor, tachycardia, and pulmonary hypertension eventually leading to the late signs cyanosis, slow heart rate / ...read more >>