: Pregnancy (especially in the first trimester), severe migraines, and chronic diseases like kidney or liver disorders are frequent causes. Additionally, chemotherapy and certain medications (like antibiotics or opioids) often list nausea as a primary side effect.

: Motion sickness from travel, unpleasant odors, and extreme heat or humidity can trigger the brain's vomiting center.

Nausea can arise from a wide range of physical and psychological stimuli:

: Conditions like food poisoning, stomach ulcers, GERD, and gastroparesis (delayed stomach emptying) often disrupt normal digestive movement.