Nausea

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

Nausea is the distressing, subjective sensation of needing to vomit. It is not a disease itself but a powerful protective mechanism designed to warn the body against toxic ingestion or internal dysfunction. Common Triggers and Causes Nausea

Nausea can arise from a wide range of physical and psychological stimuli: : Motion sickness from travel, unpleasant odors, and

: High stress, anxiety, and emotional trauma can activate the autonomic nervous system, leading to "psychogenic" nausea. The Biology of Nausea : Motion sickness from travel

The sensation is coordinated by the in the medulla oblongata of the brain. It receives signals through several pathways: Nausea: a review of pathophysiology and therapeutics - PMC