• The blood naturally has carbon dioxide in it, and our bodies need it to survive. However if the level of carbon dioxide in the blood gets too high, hypercapnia occurs. The signs and symptoms of high blood carbon dioxide depend on the severity.
  
  

Cardiovascular Symptoms

• Cardiovascular symptoms can include rapid pulse, chest pain and increased blood pressure, according to Medical Health Tests.
  
  

Mental or Mood Changes

• Possible mental and mood changes include dulled alertness and delirium, according to eCureMe. Medical Health Tests says that fatigue and confusion can also occur.
  
  

Other Symptoms

• You may also experience other symptoms. These can include redness of the skin, headache and muscle twitches, according to Medical Health Tests. eCureMe states that shortness of breath can also occur.