What are the symptoms of carbon monoxide poisoning?

Unfortunately, the symptoms of carboxyhemoglobin saturation are easily overlooked because they are often flu-like. With mild exposure, most people experience headaches, fatigue and nausea. Medium exposure could cause a severe throbbing headache, drowsiness, disorientation, confusion and an accelerated heart rate. Extreme exposure may result in unconsciousness, convulsions, cardiorespiratory failure, coma and possibly death.