While brief episodes of depersonalization or derealization can be common in the general population, the disorder is only diagnosed when these symptoms cause substantial distress or impair social, occupational, or other important areas of functioning. Signs and symptoms
The core symptoms of depersonalization-derealization disorder is the subjective experience of "unreality in ones self", or detachment from ones surroundings. People who are diagnosed with depersonalization also often experience an urge to question and think critically about the nature of reality and existence.Individuals with depersonalization describe feeling disconnected from their physicality; feeling as if they are not completely occupying their own body; feeling as if their speech or physical movements are out of their control; feeling detached from their own thoughts or emotions; and experiencing themselves and their lives from a distance. While depersonalization involves detachment from ones self, individuals with derealization feel detached from their surroundings, as if the world around them is foggy, dreamlike, or visually distorted. Individuals with the disorder commonly describe a feeling as though time is passing them by and they are not in the notion of the present. In some cases, individuals may be unable to accept their reflection as their own, or they may have out-of-body experiences. One-third to one-half of patients with DPDR also experience hearing internal voices. This is to differentiate from external voices which are more commonly found in psychosis. Additionally some individuals experience difficulty concentrating and problems with memory retrieval.
This results in painful swelling at the sides of the mouth in both adults and children, which leads to a sore throat, and occasionally pain in chewing. The infection is quite contagious. Today mumps is prevented by getting vaccinated in infancy, by a "Measles, Mumps, Rubella" (MMR) vaccination and subsequent boosters. There is no specific treatment for mumps except for hydration and painkillers with complete recovery ranging from 5–10 days. Sometimes mumps can cause inflammation of the brain, pancreatitis, testicular swelling or hearing loss.Fungal

Oral candidiasis is by far the most common fungal infection that occurs in the mouth. It usually occurs in immunocompromised individuals. Individuals who have undergone a transplant, HIV, cancer or use corticosteroids commonly develop candida of the mouth and oral cavity. Other risk factors are dentures and tongue piercing. The typical signs are a white patch that may be associated with burning, soreness, irritation or a white cheesy like appearance. Once the diagnosis is made, candida can be treated with a variety of anti fungal drugs. Traumatic
Chemical, thermal, mechanical or electrical trauma to the oral soft tissues can cause traumatic oral ulceration. Autoimmune
Sjögren syndrome is an autoimmune chronic inflammatory disorder characterised by some of the bodys own immune cells infiltrating and destroying lacrimal and salivary glands (and other exocrine glands). There are two types of Sjögrens syndrome: primary and secondary. In primary Sjögrens syndrome (pSS) individuals have dry eyes (keratoconjunctivitis sicca) and a dry mouth (xerostomia).