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

    Nasopharyngeal cancer is a malignant tumor that develops in the nasopharynx, the area where the back part of your nose…

  • Necrotizing Enterocolitis

    Necrotizing enterocolitis (NEC) is a disease of the intestine that can affect premature and newborn babies.

  • 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) are birth defects in a baby’s spine, spinal cord, or brain. They occur when a fetus’…

  • Neurofibromatosis

    Neurofibromatosis (NF) is a genetic disorder. It affects your nervous system and nerve cells. The condition produces tumors on your…

  • Nightmares and Night Terrors

    Learn about nightmares and night terrors in children.

  • Noise-Induced Hearing Loss

    Noise-induced hearing loss is permanent hearing loss that is caused by being around loud noises over a long period of…

  • Non-Hodgkin Lymphoma

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

  • Non-substance Addiction

    A non-substance addiction is sometimes called behavioral addictions. It can include gambling, sex, shopping, the internet and more.

  • Nonalcoholic Fatty Liver Disease

    Nonalcoholic fatty liver disease (NAFLD) is a buildup of fat in the liver. This common condition can be harmless but…

  • Nosebleeds

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