Generalities:

Nausea is the sensation that occurs before you expel the contents of your stomach through your mouth. While vomiting is the action itself.

The causes can be diverse, from physical to emotional.
Within the physical causes we have:

• gastroesophageal reflux
• poisoning
• anaphylactic shock
• liver disorders
• food intolerances
• infections, mainly digestive Salmonella, E coli, Amebiasis... (do the full scan)
• Various disorders of the digestive system
• Pregnancy, nausea occurs especially in the first trimester, the reasons are not fully known, but apparently they are not due to psychological issues.
• migraine

In addition to physical causes, the feeling of nausea and even vomiting can be caused by merely emotional or mental issues. The simple fact of seeing another person vomit can trigger them. Also bad smells or seeing disgusting images.

In general, situations, objects or people that cause unpleasantness or disgust can provoke these physical reactions. The experience can be recorded in the subconscious and emerge unexpectedly in the form of the nausea symptom, affecting the person's life. In this case it is necessary to apply treatments to unblock and manage trapped emotions.