What condition is often confused with the early stages of carbon monoxide poisoning boat ed?

Early stages of carbon monoxide poisoning is often confused with seasickness or intoxication.

This is so because some symptons of carbon monoxide (CO gas) poisoning are: irritated eyes, headache, nause, weakness and dizziness. As you can see those symptons are common to seasickness and intoxitation.

Carbon monoxide (CO gas) is colorless and odorless, so it may be difficult to detect the exposure to it before having some symptons of CO poisoning, but it is serious and can result in death. The victim shall be conducted to an open place promptly to receive fresh air and carried to a hospital to receive treatment  urgently.

Must be negative.substance increases