Diseases and Conditions

Find doctor-approved information about symptoms, causes, diagnosis, treatment and prevention of common diseases and conditions.

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  • Little girl sitting in mother’s lap at doctor’s office

    Munchausen Syndrome by Proxy

    Munchausen syndrome by proxy is a mental illness in which a caregiver acts as though the person under their care…

  • A person sits in a wheelchair in his room. Muscular dystrophy is a group of rare genetic diseases that weaken and shrink your muscles. It is permanent and gets worse over time.

    Muscular Dystrophy

    Muscular dystrophy is a group of genetic diseases that weaken and shrink your muscles. It is rare, but it gets…

  • Nail Fungal Infections

    A nail infection is caused by a fungus. This infection can happen in toenails and fingernails. It is more common…

  • A close up photo of a woman’s nose and mouth. Nasopharyngeal cancer develops in the nasopharynx, the area where the back part of your nose opens into your upper throat.

    Nasopharyngeal Cancer

    Nasopharyngeal cancer is a malignant tumor that develops in the space between the back of the nose and upper…

  • Mother holding premature baby’s feet with neonatal infant pulse oximeter

    Necrotizing Enterocolitis

    Necrotizing Enterocolitis is an intestinal disease that occurs mostly in premature and sick newborn babies.

  • Newborn baby girl crying and laying on bed in hospital

    Neonatal Abstinence Syndrome

    Neonatal abstinence syndrome (NAS) occurs when a baby is exposed to drugs in the womb. After birth, the baby goes…

  • 3D illustration of a fetus who has spina bifida, a neural tube defect

    Neural Tube Defects

    Neural tube defects are birth defects affecting a baby’s spine, spinal cord, or brain.

  • Hands of woman who has neurofibromatosis, a genetic disorder that causes tumors on skin.

    Neurofibromatosis

    Neurofibromatosis (NF) is a genetic disorder that affects your nervous system and nerve cells, producing tumors on your nerves.

  • Nightmares and Night Terrors

    Nightmares and night terrors can be scary parts of childhood, but they are usually triggered by everyday events and often…

  • two hands wearing rubber gloves and feeling a woman's lymph-nodes in her neck to test for non-hodgkin lymphoma

    Non-Hodgkin Lymphoma

    Non-Hodgkin lymphoma is a form of cancer that happens when your white blood cells become abnormal. It can be fatal,…

  • Non-substance Addiction

    A non-substance addiction includes things like gambling, sex, food, the internet, mobile devices, and shopping. It is also known as…

  • 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…

  • Nosebleeds

    A nosebleed is blood loss from the tissue that lines your nose. It most often occurs in only one nostril,…

  • Floor scale with tape measure wrapped around apple to illustrate obesity

    Obesity

    Obesity is a complex, and increasingly common disease that is associated with many health risks such as high blood pressure,…

  • Person washing their hands in a sink

    Obsessive-Compulsive Disorder

    Obsessive-Compulsive Disorder (OCD) is an anxiety disorder that causes unwanted thoughts and repetitive behaviors.

  • Man in an industrial factory, holding a respirator to prevent occupational respiratory disease

    Occupational Respiratory Disease

    Work can be a dangerous place if you are exposed to hazardous toxins. Certain substances put you at risk for…

  • Hydrocodone prescription bottle

    Opioid Addiction

    An opioid addiction is a powerful urge to use opioids. These are medicines that are prescribed to relieve pain, such…

  • A photo of a troubled teen meeting with his psychologist

    Oppositional Defiant Disorder

    Oppositional defiant disorder, or ODD, is a behavior condition that affects children and teens. Those who have it are angry,…

  • 3D illustration of DNA molecule

    Organic Acid Metabolism Disorders

    Organic acid metabolism disorders are a group of rare birth defects. They affect your ability to break down food into…

  • Doctor examines knee of teenage boy seated on examination bed. Osgood-Schlatter disease causes swelling and knee pain. It can be caused by pulled or overused muscles around one or both knees.

    Osgood-Schlatter Disease

    Osgood-Schlatter disease is one of the most common causes of knee pain in young children and athletes. It can affect…