Being obese increases the risk for many diseases, especially heart disease, stroke, cancer, and diabetes
Obsessive-Compulsive Disorder (OCD)
Obsessive-compulsive disorder is an anxiety disorder in which a person has an unreasonable thought, fear, or worry that he or she tries to manage through a ritualized activity to reduce the anxiety.
Occupational asthma is a type of asthma caused by exposure to inhaled irritants in the workplace. Occupational asthma is often a reversible condition, which means the symptoms may disappear when the irritants that caused the asthma are avoided.
Occupational Lung Diseases
Repeated and long-term exposure to certain irritants on the job can lead to an array of lung diseases that may have lasting effects, even after exposure ceases.
Oral Cancer (Condition)
Oral cancer is cancer found in the oral cavity (the mouth area) and the oropharynx (the throat area at the back of the mouth)
Osteoarthritis, the most common form of arthritis, is a chronic, degenerative, joint disease that affects mostly middle-aged and older adults. Osteoarthritis is characterized by the breakdown of joint cartilage and adjacent bone in the neck, lower back, knees, hips, and/or fingers.
Also called osteocartilaginous exostoses, osteochondroma is an overgrowth of cartilage and bone near the end of the bone near the growth plate.
Osteogenesis imperfecta (OI), also known as brittle-bone disease, is a genetic (inherited) disorder characterized by bones that break easily without a specific cause.
Osteomyelitis is an inflammation or swelling of bone tissue that is usually the result of an infection.
Osteoporosis, or porous bone, is a disease in which there is a loss of bone mass and destruction of bone tissue. This process causes weakening of the bones and makes them more likely to break. The bones most often affected are the hips, spine, and wrists.
Osteosarcoma is a type of bone cancer that develops in the osteoblast cells that form the outer covering of bone.
Other Benign Skin Growths
As a person grows older and is exposed to sunlight, the skin changes. Most people have some skin marks, such as freckles and moles, which may multiply or darken over time.
Other Dermatitis Conditions
The following are some of the other common dermatitis conditions: localized scratch dermatitis, nummular dermatitis, perioral dermatitis, and stasis dermatitis.
Other Liver Disorders
An autoimmune disorder is any reaction or attack of a person's immune system against its own organs and tissues.
Other Types of Skin Cancer: Kaposi's Sarcoma
Kaposi's sarcoma is a skin cancer that starts in the skin's blood vessels. Kaposi's sarcoma comes in two forms: a slow-growing form, and a more aggressive, faster-spreading form.
Ovarian cancer is a disease in which malignant cells are found in an ovary.
Ovarian Cancer and Hereditary Nonpolyposis Colon Cancer (HNPCC)
The risk for ovarian cancer is increased with hereditary nonpolyposis colon cancer (HNPCC), an autosomal dominant cancer genetic syndrome.
Overactive Adrenal Glands / Cushing's Syndrome
When adrenal glands produce excessive amounts of certain hormones, they are called "overactive."