IBD — long-term swelling and irritation in the gut — moves between two states. A flare is a time when symptoms are active. Remission is when symptoms disappear. Remission can last weeks or years, and treatment aims to keep you there long term. During a flare, the most common symptoms are diarrhea, cramping and belly pain, and weight loss. You might also feel tired, run a fever, have nausea or vomiting, or notice joint pain. Rectal bleeding and a sudden urgent need to use the bathroom can also occur. Severe warning signs — such as very heavy rectal bleeding or many bloody bowel movements in a day paired with fever — require emergency care right away. Ask your care team which changes to report and when to seek urgent help.