Gastrointestinal diseases
Ulcerative colitis
Crohn disease
Celiac disease
Microbial Diseases
Herpes simplex and Herpes Zoster
Infectious Mononucleosis
CMV
Hand-foot-mouth disease
Herpangina
HIV
Tuberculosis
Acute necrotizing gingivitis (Vincent Disease)
Syphilis
Candida and other fungal agents
Reactive
Morsicatio buccalis
Traumatic eosinophilic ulcer
Malignant Diseases
Oral SCC
Non-Hodgkin lymphoma
Rheumatoid Diseases
Behcet disease
Complex  aphtous disease
Systemic lupus erythematosus
Wegener granulomatosis
Sweet syndrome
Reactive arthritis
MAGIC syndrome (Inflamed cartilage with oral and genital ulcers)
Sarcoidosis
Reiter’s disease
Bullous and lichenoid dermatoids
Erythema multiforme
Stevens-Johnson syndrome
Bullous autoimmune diseases (Pemphigus, pemphigoid, epidermolisis bullosa, Linear IgA disease)
Lichen planus
Other Diseases
Malnutrition (Iron, folate, vitB1, vitB2, vitB6, vitB12, zinc, calcium and vitC deficiency)
Allergic contact stomatitis
Drug eruption
PFAPA (Marshall) syndrome (periodic fever, aphtous stomatitis, pharyngitis,  cervical adenitis)
Neutropenia
Drugs
NSAID (ibuprofen etc)
Cytotoxic agents
Beta blokers
Nicorandil
Others
Table 1. The diseases and conditions responsible for RAS
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