Home » DISEASES INDEX [O]

DISEASES INDEX [O]

Common Diseases List (O): Find medical advices, information and definitions about common diseases, illnesses, disorders, syndroms and deficincies. What are the signs, symptoms, causes, diagnosis, management, and treatments information. Click the disease link to view details.

Obesity is a clinical weight condition in which the body has 20 percent more weight than the recommended weight relative the an individual's height, which results in such illness as diabetes & heart disease....
Obesity in children is a form of malnutrition in which a child becomes extremely overweight. Obesity can be the cause of problems in maintaining balance as well as growth development of the physical & internal organs of child's body....
Obsessive-compulsive disorder is a psychiatric anxiety disorder. Individuals with this disorder have thoughts that are obsessive, distressing, intrusive, related with compulsions to neutralize their obsessions....
Obstetric fistula or vaginal fistula is a severe medical condition in which a fistula (hole) develops between the rectum & vagina or between the bladder & vagina after severe or failed childbirth, when adequate medical care is not available....
Obstipation is a term used to describe a severe form of constipation resulting from an obstruction or blockage in the intestines....
Obstructive sleep apnea a sleeping disorder in which a sleeping person's breathing is obstructed by a physical block to the airflow despite the effort to breathe....
Occipital horn syndrome is characterized by a deficiency in biliary copper excretion causing deformations in the skeleton....
Occipital neuralgia is a distinct form of headache marked by throbbing, piercing, or chronic pain occurring in the back of the head, upper neck & behind the ears, usually on only one side of the head....
Occupational asthma is a type of asthma caused by specific working conditions that results in a limited airflow to the lungs or excessive response of the airway....

OCD

Ocd definition: Osteochondritis dissecans is a condition of having a painful & inflamed loose joint. The formation of a lesion within the cartilage gives rise to a secondary inflammation....
The Ochoa syndrome is a congenital syndrome in which an individual has inverted facial expressions. It is also referred to as urofacial syndrome or hydronephrosis with peculiar facial expression associated with obstructive disease of the urinary tract....
Ochronosis is a metabolic disorder causing excessive homogentisic acid in the body. The face, skeletal system, cardiovascular system, respiratory system, urinary system & skin show adverse pigmentation, calcification & inflammation....
Ocular albinism is a condition in which the iris lacks melanin pigmentation. Persons with ocular albinism inherit their condition from parents. These patients however, retain their normal or near-normal skin & hair color....
Ocular Herpes pertains to a recurrent herpes infection affecting the eye, potentially causing corneal blindness....
Ocular histoplasmosis syndrome pertains to an eye disease that causes vision loss due to the spread of fungal spores from the lungs to the eye, where they tend to lodge in a layer of blood vessels known as the choroids, which primarily supplies blood & nutrients to the retina. There, these spores ca...
Ocular Melanoma is a condition which occurs in the uvea or the vascular layer of the eye between the retina & the sclera or the white of the eye. It may occur in in the front part of the uvea or the iris & ciliary body or in the choroid layer or the back part of the uvea....
Ocular motility disorders are disorders due to the malfunction of the eye's sensory-motor mechanism leading to a faulty alignment of the eyes or impairment of vision....
Ocular toxoplasmosis is a disease of the retina due to an intracellular protozoan parasite called Toxoplasma gondii....
Oculo dento digital dysplasia is a rare genetic condition resulting in individuals with small eyes, underdeveloped teeth. They also have abnormal fourth & fifth fingers. The condition is also referred to as oculo-dento-digital syndrome, oculodentodigital dysplasia & oculodentoosseous dysplasia....
Oculocerebrorenal syndrome is a congenital disorder wherein the affected individual has hydrophthalmia, cataracts, mental retardation, aminoaciduria, reduced renal ammonia production & vitamin D-resistant rickets. It is also called Lowe syndrome....
Oculocutaneous albinism type 1 definition: Oculocutaneous albinism is a condition resulting in the lack of pigmentation in the eyes, skin & hair. Other affected individuals may show an almost-normal level of pigmentation. Oculocutaneous albinism type 1 has the least amount of pigment....
Oculocutaneous albinism type 2 definition: Oculocutaneous albinism is a condition resulting in the lack of pigmentation in the eyes, skin & hair. Other affected individuals may show an almost-normal level of pigmentation. Oculocutaneous albinism type 2 is the most common type of albinism due to a mutation of the P gene....
Oculocutaneous albinism type 3 definition: Oculocutaneous albinism is a condition resulting in the lack of pigmentation in the eyes, skin & hair. Other affected individuals may show an almost-normal level of pigmentation. Oculocutaneous albinism type 3 is the result of tyrosinase-related protein-1 gene mutation....
Oculocutaneous albinism, tyrosinase positive definition: Tyrosinase-positive oculocutaneous albinism is a disorder associated poor visual acuity, hypopigmentation of the iris with transillumination defects, macular hypoplasia, nystagmus & hypopigmented fundus. The condition shows progressive increased pigmentation, as they are bale to produce melanin....
Oculo-dento-digital syndrome definition: Oculodentodigital syndrome is a rare genetic condition resulting in individuals with small eyes, underdeveloped teeth. They also have abnormal fourth & fifth fingers. The condition is also referred to as oculo-dento-digital syndrome, oculodentodigital dysplasia & oculodentoosseous dysplasia....
Oculomelic amyoplasia is a genetic disorder resulting in limb contractures from birth & eye abnormalities....
Oculopharyngeal muscular dystrophy definition: Oculopharyngeal dystrophy, which is also called oculopharyngeal muscular dystrophy, is a condition characterized by deformed eyelids, speech impediment & swallowing difficulty due to dystrophy of the pharynx....
The odontoma is a benign tumor usually associated with an unerupted tooth....
Odontophobia is commonly referred to as dental phobia, which is an irrational fear of dentists & dental procedures....
Odynophobia or algophobia is an extreme & abnormal fear of pain....
Oedema, or edema, is the excess fluid that accumulates in tissues & organs in the different parts of the body, except for the bones. The accumulation of fluids often causes major system failures that lead to death....
Ogilvie's syndrome definition: Ogilvie syndrome is found in severely ill patients with a serious acute pseudo-obstruction & dilation of the colon that has no mechanical obstruction ....
Ohtahara syndrome pertains to a neurological disorder characterized by epileptic seizures which affect newborn infants, usually within the first 3 months of life & more commonly within the first 10 days....
Oikophobia, which is also known as Domatophobia is the irrational fear of houses, in a home environment, or in a house....
Olfactophobia is also known as osmophobia, which is the fear of smell....
Oligodendroglioma pertains to a rare brain tumor that grows from the cells that encompass the supportive connective tissue around the nerve cells of the brain. Oligodendroglioma more commonly develops in adults than in children & more commonly in men than in women....
Oligohydramnios is a condition characterized by a deficiency in the amount of amniotic fluid present in the gestational sac during pregnancy....
Oligospermia pertains to a deficiency of sperms in the semen. Also known as oligozoospermatism, this condition affects male fertility, but, in some cases, may only be temporary....
Olivopontocerebellar atrophy applies to two hereditary disorders: Fickler-Winkler type OPCA, which characterized by autosomal recessive inheritance & OPCA with dementia & extrapyramidal signs, which is characterized by autosomal dominant inheritance....
Ollier disease is a non-hereditary abnormality that is commonly seen during childhood. It consists of multiple endochromas that cause the bones to be deformed. It is also known as enchodromatosis....
Omenn syndrome is a severe combined immunodeficiency associated with mutations in the recombination activating genes, affecting both B-cells & T-cells....
Omsk Hemorrhagic Fever is a very contagious infection caused by the Omsk Hemorrhagic Fever Virus....
Onchocerciasis is an infectious condition in which slender threadlike roundworms invade & are deposited under the skin or in some cases, the eyes....
An oncocytoma is an epithelial tumor in the kidney or salivary gland. These tumors are composed of oncocytes, which are special cells....
Ondine's Curse is a respiratory disorder which results in episodes of respiratory arrest during sleep. It is a serious disorder & fatal if not treated. The disorder is also referred to as congenital central hypoventilation syndrome or primary alveolar hypoventilation....
Oneirophobia is a person's unwarranted fear of dreams....
Onychogryphosis is a nail deformation characterized by the thickening of a toenail at the point where the nail curves, giving it a somewhat claw-like appearance. Onychogryphosis typically affects the big toe nail....
Onychomycosis means fungal infection of the nail. It is the very common disease of the nails & constitutes about a half of all nail abnormalities. This condition can affect toe- or fingernails, but toenail infections are particularly common. The prevalence of onychomycosis is about 6-8% in the adult...
Oophoritis is a condition characterized by inflammation of either one or both ovaries, usually occurring alongside an infection & possibly affecting female fertility....
Open-angle glaucoma pertains to a relatively common, chronic, slowly progressing form of glaucoma that usually affects both eyes. Glaucoma pertains to a group of eye conditions characterized by damage to the nerve at the back of the eye, usually due to increased pressure within the eye & ultimately ...
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