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Osteoarthritis
Arthritis is swelling of the joints. It’s painful and can limit your movement. There are many kinds of arthritis. Osteoarthritis…
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Osgood-Schlatter Disease
Osgood-Schlatter disease is one of the most common causes of knee pain in young children and athletes. It can affect…
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Organic Acid Metabolism Disorders
Organic acid metabolism disorders are a group of rare birth defects. They affect your ability to break down food into…
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Oppositional Defiant Disorder
Oppositional defiant disorder, or ODD, is a behavior condition that affects children and teens. Those who have it are angry,…
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Opioid Addiction
An opioid addiction is a powerful urge to use opioids. These are medicines that are prescribed to relieve pain, such…
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Occupational Respiratory Disease
Work can be a dangerous place if you are exposed to hazardous toxins. Certain substances put you at risk for…
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Obsessive-Compulsive Disorder
Obsessive-Compulsive Disorder (OCD) is an anxiety disorder that causes unwanted thoughts and repetitive behaviors.
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Obesity
Obesity is a complex, and increasingly common disease that is associated with many health risks such as high blood pressure,…
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Nosebleeds
A nosebleed is blood loss from the tissue that lines your nose. It most often occurs in only one nostril,…
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Nonalcoholic Fatty Liver Disease (Metabolic dysfunction-associated steatotic liver disease)
Metabolic dysfunction-associated liver disease is formerly known as nonalcoholic fatty liver disease. It is a a buildup of fat in…
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Non-substance Addiction
A non-substance addiction includes things like gambling, sex, food, the internet, mobile devices, and shopping. It is also known as…
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Non-Hodgkin Lymphoma
Non-Hodgkin lymphoma is a form of cancer that happens when your white blood cells become abnormal. It can be fatal,…
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Nightmares and Night Terrors
Nightmares and night terrors can be scary parts of childhood, but they are usually triggered by everyday events and often…
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Neurofibromatosis
Neurofibromatosis (NF) is a genetic disorder that affects your nervous system and nerve cells, producing tumors on your nerves.
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Neural Tube Defects
Neural tube defects are birth defects affecting a baby’s spine, spinal cord, or brain.
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Neonatal Abstinence Syndrome
Neonatal abstinence syndrome (NAS) occurs when a baby is exposed to drugs in the womb. After birth, the baby goes…
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Necrotizing Enterocolitis
Necrotizing Enterocolitis is an intestinal disease that occurs mostly in premature and sick newborn babies.
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Nasopharyngeal Cancer
Nasopharyngeal cancer is a malignant tumor that develops in the space between the back of the nose and upper…
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Nail Fungal Infections
A nail infection is caused by a fungus. This infection can happen in toenails and fingernails. It is more common…
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Muscular Dystrophy
Muscular dystrophy is a group of genetic diseases that weaken and shrink your muscles. It is rare, but it gets…
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