The symptoms of long term exposure to low concentrations of carbon monoxide will cause symptoms similar to the flu, such as headaches, fatigue, nausea, dizziness, weakness, drowsiness, sleepiness, vomiting and diarrhea. As levels increase, vomiting, loss of consciousness and eventually brain damage and ultimately death can result. People who suspect they have been exposed to carbon monoxide, should immediately seek fresh air and if symptoms linger, they should see their doctor quickly. Unconscious victims should be moved outdoors. Call for medical assistance and until it arrives, keep those exposed lying down and keep them warm by wrapping them in blankets.
Rest is absolutely necessary.
Those exposed should not be allowed to walk for several hours after regaining consciousness. Mild headache, few other symptoms Headache after 1-2 Hours Headache after 45 minutes, nausea, collapse, and unconsciousness after 2 hours Dangerous, unconsciousness after 1 hour Headache, dizziness, nausea after 20 min. Headache, dizziness, nausea after 5 min. Carbon monoxide is a by-product of combustion, present whenever fuel is burned. In fact, one of the major causes of carbon monoxide build up in the home is poor draft from fuel burning appliances.