Browse our Health Library to learn about treatments, conditions, and how Cedars-Sinai can support your healthcare needs.
Obesity is not just a “weight problem.” Obesity is a long-term disease that can cause serious health problems. It can affect both adults and children. Watch and learn what obesity is and the steps you can take to get to a healthy weight.
Obesity hypoventilation syndrome (OHS) is a breathing problem. It affects some children who are obese. Poor breathing causes too much carbon dioxide and too little oxygen in the blood. This is a rare but life-threatening issue. Your ...
Obesity is when a teen has too much body fat. Obesity is a serious, long-term disease.
Obsessive-compulsive disorder (OCD) is a common anxiety disorder. It causes unreasonable thoughts, fears, or worries. A person with OCD tries to manage these thoughts through rituals.
Obsessive-compulsive disorder (OCD) is a type of anxiety disorder. A child with OCD has obsessive thoughts that are not wanted. They are linked to fears, such as touching dirty objects.
Obstructive sleep apnea occurs when your breathing stops briefly during sleep. This can occur when something is blocking your airway. The stopped breathing can occur many times a night causing snoring, and daytime fatigue.
Obstructive sleep apnea is when a child briefly stops breathing while sleeping. It happens because of a blockage in the upper airway. The pause in breathing may occur many times in a night, disrupting the child’s sleep.
Work-related lung diseases are lung problems that are made worse in certain work environments. They are caused by long-term exposure to certain irritants that are breathed into the lungs. These lung diseases may have lasting effects, ...
Oculopharyngeal muscular dystrophy (OPMD) is a rare genetic condition. It causes weakness in the muscles around the upper eyelids and part of the throat called the pharynx. The condition may harm vision and cause problems swallowing and ...
The brain is part of the central nervous system (CNS). The CNS also includes the spinal cord. A tumor is an abnormal growth of tissue. An oligodendroglioma is a type of CNS tumor called a glioma.
In this condition, there is too little amniotic fluid around your baby during pregnancy. It occurs in only about 4% of pregnancies.
An omphalocele is a birth defect. It happens when your baby is forming during pregnancy. In this condition, some of your baby’s abdominal organs poke out (protrude) through an opening in the abdominal muscles. This area is in the ...
Open neural tube defects (ONTDs) are problems with the way the brain, spinal cord, or spine forms while a baby is growing in the mother's uterus.
Oppositional defiant disorder (ODD) is a type of behavior disorder. It is mostly diagnosed in childhood. Children with ODD are uncooperative, defiant, and hostile toward peers, parents, teachers, and other authority figures.
Optic neuritis is a condition that affects the eye and your vision. It occurs when the optic nerve is inflamed.
Oral cancer is cancer that starts in the mouth or throat. Oral cancer is fairly common and very curable if found and treated at an early stage. Learn more about symptoms, diagnosis, and treatments.
Oral hairy leukoplakia is a condition triggered by the Epstein-Barr virus. The condition causes white patches on your tongue. It happens most often in people with weak immune systems.
Osgood-Schlatter disease is an overuse condition in children. It's when the tendon in a knee becomes injured and inflamed.
Osteoarthritis most commonly affects the knees, hips, spine, and other weight-bearing joints in the body. Sometimes called the "wear and tear" arthritis, advancing age is a risk factor, but so are obesity and severe injury to the joint. ...
Osteoarthritis is the most common form of arthritis. It is a chronic degenerative joint disease that affects mostly middle-aged and older adults. Osteoarthritis causes the breakdown of joint cartilage. It can occur in any joint, but it ...
Osteochondroma is an overgrowth of cartilage and bone at the end of the bone near the growth plate. Most often, it affects the long bones in the leg, the pelvis, or the shoulder blade.
Osteogenesis imperfecta (OI) is an inherited (genetic) bone disorder that is present at birth. It is also known as brittle bone disease. A child born with OI may have soft bones that break (fracture) easily, bones that are not ...
An osteoid osteoma is a type of bone tumor. It is not cancer (benign). It remains in the same place it starts. It will not spread to other bones or parts of your body.
Osteomyelitis is an inflammation or swelling of bone tissue. It’s most often caused by an infection. Bone infection may occur for many reasons and can affect children or adults.
Acute osteomyelitis is an infection in the bone. It develops over a short time, usually about 2 weeks. In children, osteomyelitis is more common in the long bones of the arms and legs. But it can affect any bone in the body. ...
Osteoporosis is a disease that causes weak, thinning bones. This leaves the bones at greater risk of breaking. The bones most often affected are the hips, spine, and wrists.
Osteosarcoma is cancer of the bone. The cancer (malignant) cells make immature bone cells (osteoid). Osteosarcoma is rare, but it is the most common type of bone cancer in children and teens. It is most common when teens have growth ...
Osteosarcoma often affects the long bones around the knee. It happens most often in children, teens, and young adults.
Ovarian cancer is cancer that starts in your ovaries or at the end of the fallopian tubes next to the ovary. Learn more about symptoms, diagnosis, and treatments.
An ovarian cyst is a fluid-filled sac that forms on or inside an ovary. Most women will not need treatment. In some cases, you may need surgery to remove part or all of your ovary.