Learn more about what ails you. Here are some common symptoms.
Common Symptoms:
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Diseases and Medical Conditions M-O provides down-to-earth, comprehensive definitions of hundreds of ailments and illnesses beginning with the letters M-O. Each listing identifies causes, incidence and risk factors, notes symptoms, outlines tests and discusses treatments and support groups where applicable.
Featured Article: Occupational Asthma
Occupational asthma is attacks of wheezing, cough or breathing difficulty from work place agents. Learn about occupational asthma causes, symptoms, treatment and prevention. See more »
Normal Pressure Hydrocephalus (NPH)
Normal pressure hydrocephalus (NPH) is a cerebrospinal fluid accumulation that retains normal CSF pressure. Learn about NPH causes, symptoms, treatment and prevention.
See more »Nummular Eczema
Nummular eczema is a skin disorder that causes itchy, coin-shaped lesions. Learn about nummular eczema causes, symptoms, treatment and prevention.
See more »Nursemaid’s Elbow
Pulled elbow or Nursemaid’s elbow is elbow joint dislocation and makes movement painful. Learn about pulled elbow prevention, causes, symptoms, tests and treatment.
See more »Obesity Hypoventilation Syndrome (OHS)
Obesity hypoventilation syndrome (OHS) is when obese people do not breathe enough oxygen while asleep. Learn about OHS causes, symptoms, treatment and prevention.
See more »Obsessive-compulsive Disorder
Obsessive compulsive disorder (OCD) is an anxiety disorder where a person performs tasks to relieve obsessions. Learn about obsessive compulsive disorder symptoms, tests and treatments.
See more »Obsessive-compulsive Personality Disorder
Obsessive-compulsive personality disorder is a chronic preoccupation with rules, order and control. Learn about obsessive-compulsive personality disorder causes, symptoms, treatment and prevention.
See more »Obstructive Uropathy
Obstructive uropathy is urine flow blockage causing it to back up and injure kidneys. Learn about obstructive uropathy causes, symptoms, treatment and prevention.
See more »Occupational Asthma
Occupational asthma is attacks of wheezing, cough or breathing difficulty from work place agents. Learn about occupational asthma causes, symptoms, treatment and prevention.
See more »Occupational Hearing Loss
Occupational hearing loss is inner ear damage from noise or vibration from entertainment or certain occupations. Learn about occupational hearing loss causes, symptoms, treatment and prevention.
See more »Olivopontocerebellar Atrophy
Olivopontocerebellar atrophy is a neurodegenerative disease that shrinks certain brain areas. Learn about olivopontocerebellar atrophy causes, symptoms, treatment and prevention.
See more »Omphalocele
Omphalocele is a birth defect in which the intestine or abdominal organs protrude from the navel. Learn about omphalocele causes, symptoms, treatment and prevention.
See more »Opiate Withdrawal
Opiate withdrawal is shaking, headache, nausea, vomiting, agitation or anxiety from stopping opiate use. Learn about opiate withdrawal symptoms, tests and treatment.
See more »Opioid Intoxication
Opioid intoxication causes an abnormal mental state of excessive sleepiness or unconsciousness. Learn about opioid intoxication symptoms, treatment and prevention.
See more »Oppositional Defiant Disorder
Oppositional defiant disorder is a pattern of hostile and defiant behavior toward authority figures. Learn about oppositional defiant disorder symptoms, tests and treatment.
See more »Optic Glioma
Optic Glioma information from HowStuffWorks. Learn about causes, symptoms and treatments of Optic Glioma.
See more »Optic Nerve Atrophy
Optic nerve atrophy is tissue death of the nerve that carries vision information. Learn about optic nerve atrophy causes, symptoms, treatment and prevention.
See more »Optic Neuritis
Optic neuritis is optic nerve inflammation that may cause sudden reduced vision. Learn about optic neuritis causes, symptoms, treatment and prevention.
See more »Oral Cancer
Oral cancer is a malignant tumor of the lips, tongue, roof or floor of the mouth, cheeks or gums. Learn about oral cancer symptoms, tests and treatment.
See more »Orbital Cellulitis
Orbital cellulitis is an acute infection of the tissues immediately surrounding the eye. Learn about orbital cellulitis causes, symptoms, treatment and prevention.
See more »Orbital Pseudotumor
Orbital pseudotumor is orbital tissue swelling behind the eye. Learn about orbital pseudotumor causes, symptoms, treatment and prevention.
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