Oxygen deficiency includes, but is not limited to, the following signs and symptoms:

General – fatigue, insomnia
Neurological – headache, memory loss, forgetfulness, concentration difficulties, dizziness
Psychological – depression, anxiety, agitation, irritability, impatience, anger, aggressiveness, apathy, boredom, inactivity, unrealistic expectations, loss of
ambition, foreboding
Cardiovascular - chest pressure, palpitations
Respiratory – frequent sighing, breathing problems, yawning
Gastrointestinal - swallowing difficulties, indigestion, gas, constipation, abdominal pain
Musculoskeletal – numbness, weakness, teeth grinding, joint pain, muscle tension
Endocrine - decreased libido
Immunity – infections, accelerated aging, cancer
Other - susceptibility to climate changes, reduced body temperature, most any diagnosed disease