When your oxygen levels fall below normal, it is a cause for concern and that state is called hypoxemia. In normal circumstances, PaO2 reading less than 80 mm Hg or 95% is considered to be of low levels. If the levels stay low for long, you may show symptoms of cyanosis.
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The lower the oxygen levels, the more severe the hypoxemia will be. This leads to complications in body tissues and organs. Symptoms of hypoxemia are headache, breathlessness, fast heartbeat, coughs, wheezing, confusion, bluish coloured nails, lips, and other parts of the skin. Symptoms of cyanosis are skin discolouration (typically, the skin turns blue), on lips, toes and fingers, and mucous membranes.
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In these circumstances, doctors are to be consulted immediately.
