Hello Thanks for writing to us. There are many possible causes for nausea after eating. Identifying the cause will help in right treatment. Most of the time, lifestyle and diet changes can help treat your nausea and prevent it from returning. However major reasons are: Food allergies Certain foods, like shellfish, nuts, or eggs, can fool your immune system into identifying them as harmful foreign invaders. When you eat one of these trigger foods, your immune system launches a series of events that leads to the release of histamine and other chemicals. These chemicals produce allergy symptoms, which can range from hives and mouth swelling, to nausea. Food poisoning Food that sits around for too long or isn’t properly refrigerated attracts bacteria, viruses, and parasites that can make you sick. Food poisoning symptoms like nausea, vomiting, and diarrhea, typically start within a few hours after you’ve eaten contaminated food. Stomach virus This common bug, which is sometimes nicknamed the “stomach flu,” infects the intestines and triggers gastrointestinal (GI) symptoms like nausea, vomiting, and diarrhea. You can catch a stomach virus by getting too close to someone who’s sick, or by eating food or drinking water that’s been contaminated with the virus. Acid reflux A burning feeling behind your breastbone, known as heartburn, is the hallmark symptom of gastroesophageal disease (GERD), but this condition can cause nausea, too. GERD happens when the muscular valve between your esophagus and stomach malfunctions, allowing stomach acid to leak up into your esophagus. Anxiety and stress Stress doesn’t only take a toll on your emotions. It affects your physical health, too. A difficult breakup or job loss can make you lose your appetite, or feel sick after you eat. The nausea should let up once you get your stress under control. Irritable bowel syndrome (IBS) IBS is a collection of GI symptoms, which can include abdominal pain, diarrhea, and constipation. Nausea is one of the most common complaints in people with IBS. I would advise you to get it checked with your doctor. Your doctor will ask you to describe your symptoms, including when you feel nauseated, how long the feeling lasts, and what seems to trigger it. Keeping a diary of what you eat and how you feel afterward can help your doctor make a diagnosis. Depending on what condition your doctor suspects, you might need tests, such as: blood or urine tests a skin test to see if you have food allergies upper endoscopy to see whether your esophagus is swollen, which is a sign of GERD CT, X-ray, or ultrasound scans to check your organs for signs of disease colonoscopy, flexible sigmoidoscopy, or upper or lower GI series to look for problems in your GI tract I hope you are helped. Thanks Dr. Tripat Mehta