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Causes

Common Causes

Acute myeloid leukemia

Dental implant

Gingivitis

Haemophillia

Heparin Injection

Idiopathic thrombocytopenic purpura

Pregnancy

Rough teeth brushing

Scurvy

Vitamin K deficiency

Von willebrand 's disease

Causes by Organ System

Cardiovascular	Bothrops venom, hereditary hemorrhagic telangiectasias, tuberous sclerosis
Chemical / poisoning	Radium jaw, arsenic poisoning, lead poisoning
Dermatologic	Lichen planus (oral), linear immunoglobulin A dermatosis, pemphigus, hereditary hemorrhagic telangiectasias, idiopathic thrombocytopenic purpura, thrombocytopenia, tuberous sclerosis, bothrops venom, scurvy, haemophillia, systemic lupus erythromatosus, kaposi's sarcoma, ebola hemorrhagic fever
Drug Side Effect	Acitretin , aspirin, bevacizumab injection, cholestyramine resin, clofarabine injection, co-codamol, colestipol, coumatetralyl, cyclosporine, cytotoxic chemotherapy, efalizumab injection, heparin injection, itraconazole , mercury(II) chloride poisoning, methotrexate, mycophenolate , pamidronate injection , paracetamol, phenytoin (oral), pregabalin , protiodide, venlafaxine, zoledronic acid injection
Ear Nose Throat	Dry mouth, Vincent's angina, hereditary hemorrhagic telangiectasias
Endocrine	No underlying causes
Environmental	Diabetes, progesterone, arsenic poisoning, bothrops venom, radium jaw, lead poisoning
Gastroenterologic	Cholestyramine Resin , essential thrombocytosis , ebola hemorrhagic fever, waldenstrom macroglobulinemia, hereditary hemorrhagic telangiectasias
Genetic	Haemophillia, hereditary hemorrhagic telangiectasias
Hematologic	Aplastic anemia, essential thrombocytosis, idiopathic thrombocytopenic purpura, lead poisoning, thrombocytopenia, vitamin K deficiency, von willebrand 's disease, waldenstrom macroglobulinemia, coumatetralyl, haemophillia, bolivian hemorrhagic fever, ebola hemorrhagic fever, rift valley fever, acute myeloid leukemia, systemic lupus erythromatosus
Iatrogenic	No underlying causes
Infectious Disease	Bolivian hemorrhagic fever, ebola hemorrhagic fever, ehrlichiosis (canine), herpes simplex virus, rift valley fever, MMR vaccine
Musculoskeletal / Ortho	Systemic lupus erythromatosus
Neurologic	Tuberous sclerosis, phenytoin (oral), pregabalin , waldenstrom macroglobulinemia, rift valley fever, ebola hemorrhagic fever, bothrops venom
Nutritional / Metabolic	Scurvy, diabetes, vitamin K deficiency
Obstetric/Gynecologic	Pregnancy, progesterone, von willebrand's disease
Oncologic	Acute myeloid leukemia, kaposi's sarcoma, oral cancer, cytotoxic chemotherapy
Opthalmologic	Rift valley fever
Overdose / Toxicity	Chronic alcoholism, arsenic poisoning, lead poisoning
Psychiatric	Stress
Pulmonary	No underlying causes
Renal / Electrolyte	Tuberous sclerosis, bothrops venom, systemic lupus erythromatosus
Rheum / Immune / Allergy	Systemic lupus erythromatosus, linear immunoglobulin A dermatosis, pemphigus, mycophenolate , haemophillia
Sexual	Fellatio, herpes simplex virus, kaposi's sarcoma
Trauma	Rough teeth brushing, wisdom teeth
Urologic	No underlying causes
Dental	Dental implant, epulis, extraction (dental), gingivitis, Ludwig's angina, periodontitis, poor oral hygiene, rough teeth brushing, wisdom teeth, radium jaw, lead poisoning, scurvy
Miscellaneous	Body piercing, MMR vaccine, stress