Diseases and Conditions

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

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All conditions that start with the letter N
  • Nail Fungal Infections

    Learn about fungal nail infections and how they are treated.

  • Nasopharyngeal Cancer

    Nasopharynx cancer is a malignant tumor that develops in the nasopharnyx (where the back part of your nose opens into…

  • Necrotizing Enterocolitis

    Necrotizing enterocolitis (NEC) is a serious intestinal disease. It mostly occurs in premature infants or babies with weakened immune systems…

  • Neonatal Abstinence Syndrome

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

  • Neural Tube Defects

    Neural tube defects (NTDs) include several birth defects. They affect a fetus’ spine, spinal cord, or brain from forming…

  • Neurofibromatosis

    Neurofibromatosis (NF) is a genetic disorder. There are two main types with different symptoms. Learn more about the treatment and…

  • Nightmares and Night Terrors

    Learn about nightmares and night terrors in children.

  • Non-Hodgkin Lymphoma

    Non-Hodgkin lymphoma is cancer of the lymph tissue. The most notable symptom is swelling of lymph nodes in your neck,…

  • Nonalcoholic Fatty Liver Disease

    Nonalcoholic fatty liver disease (NAFLD) is a buildup of fat in the liver. It is a common condition.

  • Nosebleeds

    A nosebleed is active blood loss from the tissue that lines your nose.