9Nausea and Vomiting
Nausea and vomiting can be caused by dozens of conditions including stomach infections, allergies, headaches, anxiety and motion sickness. But if it lasts for more than 24 hours, it is very important to see a doctor immediately.
Persistent nausea and vomiting for no apparent reason is a sign of colon cancer. A colorectal or rectal tumor could be obstructing the bowel and inhibiting the passage of stools or gas, resulting in these symptoms.
