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INFO: Full form for OD is Opportunistic Disease in Medical category
OD also has other full forms in other categories mentioned below.

An occupational disease is any chronic ailment that occurs as a result of work or occupational activity. It is an aspect of occupational safety and health. An occupational disease is typically identified when it is shown that it is more prevalent in a given body of workers than in the general population, or in other worker populations. The first such disease to be recognised, squamous-cell carcinoma of the scrotum, was identified in chimney sweep boys by Sir Percival Pott in 1775. Occupational hazards that are of a traumatic nature (such as falls by roofers) are not considered to be occupational diseases.

Under the law of workers' compensation in many jurisdictions, there is a presumption that specific disease are caused by the worker being in the work environment and the burden is on the employer or insurer to show that the disease came about from another cause. Diseases compensated by national workers compensation authorities are often termed occupational diseases. However, many countries do not offer compensations for certain diseases like musculoskeletal disorders caused by work (e.g. in Norway). Therefore, the term work-related diseases is utilized to describe diseases of occupational origin. This term however would then include both compensable and non-compensable diseases that have occupational origins.

In a landmark study published by the World Health Organization and the International Labour Organization in 2021, 745,000 fatalities from ischemic heart disease and stroke events in 2016 were attributed to exposure to long working hours. With these UN estimates, the global burden of work-related cardiovascular diseases has been quantified for the first time.

INFO: Full form for OD is Occupational Dermatitis in Medical category
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Oligodendrogliomas are a type of glioma that are believed to originate from the oligodendrocytes of the brain or from a glial precursor cell. They occur primarily in adults (9.4% of all primary brain and central nervous system tumors) but are also found in children (4% of all primary brain tumors).

Ollier disease is a rare sporadic nonhereditary skeletal disorder in which typically benign cartilaginous tumors (enchondromas) develop near the growth plate cartilage. This is caused by cartilage rests that grow and reside within the metaphysis or diaphysis and eventually mineralize over time to form multiple enchondromas. Key signs of the disorder include asymmetry and shortening of the limb as well as an increased thickness of the bone margin. These symptoms are typically first visible during early childhood with the mean age of diagnosis being 13 years of age. Many patients with Ollier disease are prone to develop other malignancies including bone sarcomas that necessitate treatment and the removal of malignant bone neoplasm. Cases in patients with Ollier disease has shown a link to IDH1, IDH2, and PTH1R gene mutations. Currently, there are no forms of treatment for the underlying condition of Ollier disease but complications such as fractures, deformities, malignancies that arise from it can be treated through surgical procedures. The prevalence of this condition is estimated at around 1 in 100,000. It is unclear whether the men or women are more affected by this disorder due to conflicting case studies.

INFO: Full form for OD is Organ Dysfunction in Medical category
OD also has other full forms in other categories mentioned below.

"Once a Day" is a song written by Bill Anderson and recorded as the debut single by American country artist Connie Smith. It was produced by Bob Ferguson for her self-titled debut album. The song was released in August 1964, topping the Billboard country music chart for eight weeks between late 1964 and early 1965. It was the first debut single by a female artist to reach number one on the Billboard Hot Country Songs. This song peaked at number one for the week of November 28, 1964, and it stayed at number one for eight consecutive weeks, a record for a female solo artist for nearly 50 years, until it was surpassed by Taylor Swift's "We Are Never Ever Getting Back Together" in December 2012.

In 2021, "Once a Day" was deemed "culturally, historically, or aesthetically significant" by the Library of Congress and selected for preservation in the National Recording Registry.

Osteochondritis dissecans (OCD or OD) is a joint disorder primarily of the subchondral bone in which cracks form in the articular cartilage and the underlying subchondral bone. OCD usually causes pain during and after sports. In later stages of the disorder there will be swelling of the affected joint which catches and locks during movement. Physical examination in the early stages does only show pain as symptom, in later stages there could be an effusion, tenderness, and a crackling sound with joint movement.

OCD is caused by blood deprivation of the secondary physes around the bone core of the femoral condyle. This happens to the epiphyseal vessels under the influence of repetitive overloading of the joint during running and jumping sports. During growth such chondronecrotic areas grow into the subchondral bone. There it will show as bone defect area under articular cartilage. The bone will then possibly heal to the surrounding condylar bone in 50% of the cases. Or it will develop into a pseudarthrosis between condylar bone core and osteochondritis flake leaving the articular cartilage it supports prone to damage. The damage is executed by ongoing sport overload. The result is fragmentation (dissection) of both cartilage and bone, and the free movement of these bone and cartilage fragments within the joint space, causing pain, blockage and further damage. OCD has a typical anamnesis with pain during and after sports without any history of trauma. Some symptoms of late stages of osteochondritis dissecans are found with other diseases like rheumatoid disease of children and meniscal ruptures. However, the disease can be confirmed by X-rays, computed tomography (CT) or magnetic resonance imaging (MRI) scans.

Non-surgical treatment is successful in 50% of the cases. If in late stages the lesion is unstable and the cartilage is damaged, surgical intervention is an option as the ability for articular cartilage to heal is limited. When possible, non-operative forms of management such as protected reduced or non-weight bearing and immobilization are used. Surgical treatment includes arthroscopic drilling of intact lesions, securing of cartilage flap lesions with pins or screws, drilling and replacement of cartilage plugs, stem cell transplantation, and in very difficult situation in adults joint replacement. After surgery rehabilitation is usually a two-stage process of unloading and physical therapy. Most rehabilitation programs combine efforts to protect the joint with muscle strengthening and range of motion. During an immobilization period, isometric exercises, such as straight leg raises, are commonly used to restore muscle loss without disturbing the cartilage of the affected joint. Once the immobilization period has ended, physical therapy involves continuous passive motion (CPM) and/or low impact activities, such as walking or swimming.

OCD occurs in 15 to 30 people per 100,000 in the general population each year. Although rare, it is an important cause of joint pain in physically active children and adolescents. Because their bones are still growing, adolescents are more likely than adults to recover from OCD; recovery in adolescents can be attributed to the bone's ability to repair damaged or dead bone tissue and cartilage in a process called bone remodeling. While OCD may affect any joint, the knee tends to be the most commonly affected, and constitutes 75% of all cases. Franz König coined the term osteochondritis dissecans in 1887, describing it as an inflammation of the bone–cartilage interface. Many other conditions were once confused with OCD when attempting to describe how the disease affected the joint, including osteochondral fracture, osteonecrosis, accessory ossification center, osteochondrosis, and hereditary epiphyseal dysplasia. Some authors have used the terms osteochondrosis dissecans and osteochondral fragments as synonyms for OCD.

INFO: Full form for OD is Once Daily in Medical category
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INFO: Full form for OD is Oculus Dexter (Right Eye) in Medical category
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INFO: Full form for OD is Order Disorder in Medical category
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A drug overdose (overdose or OD) is the ingestion or application of a drug or other substance in quantities greater than are recommended. Typically it is used for cases when a risk to health will potentially result. An overdose may result in a toxic state or death.

INFO: Full form for PG is Paediatric and Geriatric in Medical category
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INFO: Full form for PG is Pemphigoid Gestationis in Medical category
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