There is no such clinical term as apical inflammation, which mostly refers to periapical inflammation of the tooth. Symptoms of acute periapical inflammation include occlusal pain, throbbing pain, redness and swelling of the root tip and pus in the gums. Chronic periapical inflammation may present with chewing discomfort and fistulae in the gums. 1. Acute periapical inflammation: In the plasma stage, the affected tooth is highlighted by occlusal pain. In the periapical abscess stage, a persistent throbbing occurs. In the case of subperiosteal abscess, the pain is extremely severe, the redness and swelling of the root apex is obvious, and it can be accompanied by systemic symptoms. In the case of submucosal abscesses, the pain is reduced and the gums become pus-filled. 2. Chronic apical periodontitis: generally no obvious symptoms, some patients can have discomfort when chewing. There are also patients with fistulas in the gums. If there is apical periodontitis, it is recommended to consult a doctor in time to avoid adverse effects.