Indigestion can be pain or discomfort in your upper abdomen (dyspepsia) or burning pain behind the breastbone (heartburn). Dyspepsia and heartburn may occur together or on their own. Symptoms usually appear soon after eating or drinking. Common associated symptoms include: feeling full or bloated feeling sick (nausea) belching bringing up (regurgitating) fluid or food into the gullet (oesophagus) Indigestion is a common problem that affects many people, but in most cases it's mild and only occurs occasionally.