Nausea is a common sensation of unease in the stomach that often precedes vomiting. It can result from infections, motion sickness, pregnancy, food poisoning, or side effects of medications. The body triggers nausea as a protective mechanism to expel harmful substances. Symptoms may include dizziness, sweating, and increased salivation. Treatment depends on the cause and may involve hydration, rest, or medications to control symptoms. In some gastrointestinal infections, doctors may prescribe drugs like nitazoxanide 500mg to address underlying pathogens. Maintaining a light diet and avoiding strong odors can help manage mild nausea effectively and prevent complications.