Common causes of nausea without vomiting include medical abdominal conditions, brain or spinal fluid conditions and vertigo, according to Drugs.com. Nausea is also a side effect of chemical body changes such as pregnancy, medications, low blood sugar and alcohol intoxication or withdrawal.
Common abdominal conditions that cause nausea include hepatitis, pancreatitis, gastroesophageal reflux and gallbladder problems. Constipation and menstruation are also causes of nausea, says Drugs.com. Migraines, head injuries, brain tumors and meningitis are causes of nausea associated with the brain and spinal fluid. Glaucoma can also cause nausea due to pressure on the nerves behind the eye.
Vertigo is a dizzy sensation of spinning or falling when one is not actually moving. Conditions that cause vertigo include motion sickness, ear infections and brain or nerve tumors, says Drugs.com.
Roughly half of all women experience nausea during the first few months of pregnancy and many women on birth control suffer from chronic nausea. Prescription, over-the-counter and herbal medicines all have the potential to cause nausea as a side effect, claims Drugs.com. Chemotherapy medications and antidepressants are some of the most common nausea-inducing drugs.
Many people find that nausea is hard to describe, says Drugs.com. It is generally defined as a very uncomfortable, but not painful, sensation that is felt in the back of the throat, the chest or upper abdomen.