Appendicitis symptoms generally manifest as sudden onset of severe pain in the upper right abdomen, which can radiate to the right shoulder, scapula, and back. The initial pain is typically a feeling of distension, which gradually develops into intermittent, colicky pain. This usually occurs suddenly after a full meal or consuming a large amount of fatty foods. The pain is persistent and may worsen in episodes. There is also usually accompanying fever, ranging from mild to moderate, but high fevers with chills, abdominal muscle rigidity, and stiffness can occur, along with tenderness; pain intensifies when pressed. Symptoms also include nausea, vomiting, constipation, and indigestion.