These day I am getting constant nausea because of which I feel like pucking every time I eat. As far as the condition of my stomach is concerned it is perfectly fine, I don’t have any gas or constipation trouble. But, I am clueless about the nausea trouble; I feel that I am pregnant. Can constant nausea be a sign of pregnancy? Tell me what the other reasons for getting constant nausea? Come out with a good researched answer please.