Diseases and Conditions

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

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  • Mountain climber using mini portable oxygen cylinder to avoid and treat high-altitude illness

    High-Altitude Illness

    High-altitude illness can occur when you travel to altitudes higher than 8,000 feet. It happens when your body doesn’t get…

  • Hip Fractures

    A hip fracture is a break in your thigh bone (femur) where it connects to your pelvic bone. Hip fractures…

  • Best and worst positions for your baby to help prevent hip dysplasia

    Hip Problems in Infants

    A hip problem in an infant is known as developmental dysplasia of the hip. It can lead to dislocation of…

  • newborn baby crying in white bed

    Hirschsprung’s Disease

    Hirschsprung disease is a rare birth defect that is caused by missing nerve cells in the intestine. It is treated…

  • female with hairy arm

    Hirsutism

    Hirsutism causes women to have excess hair on their face or body. It can have different causes, including genetics and…

  • HIV

    The human immunodeficiency virus (HIV) attacks the body’s immune system. A healthy immune system is what keeps you from getting…

  • Little boy sleeping in his bed suffering from hives

    Hives (Urticaria)

    Hives (urticaria) are bumps or patches on the surface of your skin. They can be red, itchy, and swollen and…

  • Bottle of HPV vaccine sitting next to syringe

    Human Papillomavirus (HPV)

    HPV is a common sexually transmitted virus.

  • Huntington's Disease

    Huntington’s disease is a rare, progressive brain disorder. It gradually kills nerve cells in the brain, taking away physical and…

  • Illustration of a blood clot in an artery leading to the heart

    Hypercoagulation

    Hypercoagulation is when your blood forms a clot when it shouldn’t. This clot can then travel through your body. This…

  • Close up of a man wearing a dress shirt with sweat stains in the armpit

    Hyperhidrosis

    Hyperhidrosis is excessive sweating.

  • sore throat, shown red, isolated on white background

    Hyperparathyroidism

    Hyperparathyroidism is a condition that causes you to have too much calcium in your bloodstream and not enough in your…

  • female doctor checking for Hyperthyroidism

    Hyperthyroidism

    Hyperthyroidism, or an overactive thyroid, means your thyroid gland makes too much hormone. This can cause weight loss, tremors, and…

  • A cross section of a pituitary gland and endocrine cells

    Hypopituitarism

    Hypopituitarism is a disorder in which the pituitary gland doesn’t make enough hormones.

  • A freezing cold man stands outside in the falling snow at night. Hypothermia occurs when you are exposed to bitter cold for a long time and your body temperature drops below 95°F.

    Hypothermia

    Hypothermia is a medical condition. It occurs when you are exposed to bitter cold for a long time and your…

  • doctor examining female patient for hypothyroidism while working in his office

    Hypothyroidism

    Hypothyroidism is an underactive thyroid. Your thyroid controls your metabolism, heart rate, muscles, bones, and other organs.

  • illustration of a blood vessel carrying blood cells

    Idiopathic Thrombocytopenic Purpura (ITP)

    Idiopathic thrombocytopenic purpura (ITP) is a bleeding disorder. When you have ITP, your immune system destroys the platelets in your…

  • Woman holding antacid tablet and glass of water

    Indigestion (Dyspepsia)

    Indigestion happens when your body has trouble digesting food. Anyone can get indigestion, either on occasion or as part of…

  • Infant Jaundice

    Infant jaundice is common. It can make your baby’s skin, eyes, and mouth turn yellow. While it may look odd,…

  • Couple meeting with doctor

    Infertility

    Infertility means a couple isn’t able to become pregnant after 1 year of having regular, unprotected sex. Infertility can affect…