What is the definition of nausea, and what are its common causes?

Nausea Defined:
Nausea is a distressing sensation, often a precursor to vomiting. It's that queasy feeling in your stomach that makes you feel like you might lose your lunch.

Common Causes:
1. Motion Sickness: It occurs during travel when your inner ear, which regulates balance, conflicts with what your eyes perceive.

2. Viral Infections: Stomach viruses or foodborne pathogens can irritate the stomach lining.

3. Pregnancy: Morning sickness is a well-known sidekick to early pregnancy due to hormonal changes.

4. Medications: Some prescription drugs and even over-the-counter pills can trigger nausea as a side effect.

5. Overeating: When you indulge in too much food or alcohol, your stomach can rebel.

6. Gastrointestinal Disorders: Conditions like gastritis, acid reflux, or irritable bowel syndrome can lead to chronic nausea.

7. Migraines: Nausea often accompanies severe headaches, making the discomfort even worse.

8. Emotional Factors: Stress, anxiety, and fear can upset your stomach and induce nausea.

9. Infections: Besides viruses, bacterial infections in the gut can bring on nausea.

10. Chemotherapy: Cancer treatments, like chemotherapy, are notorious for causing nausea.

Conclusion:
Nausea is a universal experience, often a symptom rather than a condition itself. If it becomes chronic or debilitating, seeking medical advice is wise to uncover the underlying cause and explore potential treatments.