Heart burn is one of the most common issues in recent times and is frequently mistaken to be a heart attack by many. Heart burn is usually the pain or burn that occurs when the acid in stomach flows back to esophagus. It can get worse after eating few foods or lying down. Most people also have pressure on their throat because of acid reflux. 

Here are few foods that can be avoided in case of heart burn;

• High fat foods – Foods that are deep fried, fast foods, cheese, etc. Can cause heart burn. These foods can cause more acid production and bile salts that can irritate the digestive tract more. This can lead to acid reflux. 
• Large meals – When you have too much food, your stomach expands. This increases the risk for opening of sphincter that prevents the acid from going up to esophagus. Small frequent meals help to reduce symptoms. 
• Spicy foods – These foods delays gastric emptying which in turn leads to gastric reflux. Use mild spices and tempering in your foods when you have heart burn. 
• Chocolate – Cocoa in chocolate helps to relax the upper muscles of GI tract and the sphincter, leading to increased flush of acid upwards to the tube. This can worsen the already existing gastric issues or heart burn. 
• Carbonated beverages – Sodas that contain large amounts of gas open up the esophageal sphincter forcibly. This may create heart burn because along with gas, acid also travels up the tube. 
• Alcohol and caffeinated beverages - These beverages increase the gastric acid secretion and cause the reflux in esophagus. 

You can include small, frequent meals to reduce heart burn. Include alkaline foods like bananas, melons, low-fat milk. Drink thin, plain, homemade buttermilk that helps sooth the stomach. Include watery foods like water-melon, cucumber, herbal tea (jeera and ajwain water), etc. 

Maintain your weight in ideal body weight range. Avoid spicy foods. Avoid smoking and drinking alcohol. 
Please consult a doctor if it is very regular and is not going away or reducing symptoms after a day. 

References: 
https://www.webmd.com/heartburn-gerd/triggers
https://www.healthline.com/nutrition/foods-that-cause-heartburn
https://www.hopkinsmedicine.org/health/wellness-and-prevention/gerd-diet-foods-that-help-with-acid-reflux-heartburn
https://www.mayoclinic.org/diseases-conditions/heartburn/symptoms-causes/syc-20373223
https://www.medicalnewstoday.com/articles/foods-that-cause-heartburn
https://www.health.harvard.edu/diseases-and-conditions/what-to-eat-when-you-have-chronic-heartburn