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 H
  • H1N1 Influenza

    H1N1 influenza is a viral infection. It’s not the same as seasonal flu (influenza). The first outbreak occurred in 2009…

  • Hair Loss

    It is normal to shed some hair each day. However, excessive shedding can result in balding.

  • Halitosis

    Learn about what causes halitosis and what you can do to prevent it.

  • Hammer Toe

    Hammer toe is a deformity where the middle joint of the toe bends upward and the end of the toe…

  • Hand, foot, and mouth disease

    Hand, foot, and mouth disease is a contagious virus that is common in infants and children under the age of…

  • Hashimoto's Disease

    Hashimoto’s disease is an autoimmune disease that affects your thyroid gland.

  • Head Injuries

    A head injury is any harm to your brain, skull, or scalp. It can be mild, moderate, or severe.

  • Head Lice

    Head lice are small wingless insects (bugs) that can get on your hair and scalp. They feed on very small…

  • Headaches

    There are several different types of headaches. Migraines and tension headaches are the most common.

  • Hearing Problems in Children

    There are many types of hearing problems in children. Many of these problems result in hearing loss. Loss may be…

  • Heart Attack

    A heart attack is an emergency medical condition that indicates your heart is not getting enough oxygen. It can be…

  • Heart Failure

    Heart failure means your heart isn’t pumping blood as well as it should. It is the result of other diseases…

  • Heart Murmurs

    A heart murmur is an abnormal noise between heartbeats and can be innocent or indicative of a more serious health…

  • Heart Palpitations

    Heart palpitations are the sensation that your heart is pounding, racing, or skipping beats (fluttering).

  • Heartburn

    Heartburn is a burning feeling in the lower chest, along with a sour or bitter taste in the throat and…

  • Heat Exhaustion and Heatstroke

    Heat exhaustion and heatstroke are serious conditions. Learn the warning signs of these heat-related illnesses, as well as how to…

  • Heat Rash

    Heat rash is a common skin irritation that often occurs in hot, humid weather. It causes small bumps and itchiness,…

  • HELLP Syndrome

    HELLP syndrome is a rare but serious illness during pregnancy.

  • Hemolytic Uremic Syndrome

    Hemolytic uremic syndrome (HUS) is a condition involving red blood cells and your kidneys. HUS happens after you get an…

  • Hemorrhoids

    Hemorrhoids are swollen veins in your rectum or anus. The type of hemorrhoid you have depends on where it…