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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…
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Hip Fractures
A hip fracture is a break in your thigh bone (femur) where it connects to your pelvic bone. Hip fractures…
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Hip Problems in Infants
A hip problem in an infant is known as developmental dysplasia of the hip. It can lead to dislocation of…
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Hirschsprung’s Disease
Hirschsprung disease is a rare birth defect that is caused by missing nerve cells in the intestine. It is treated…
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Hirsutism
Hirsutism causes women to have excess hair on their face or body. It can have different causes, including genetics and…
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HIV
The human immunodeficiency virus (HIV) attacks the body’s immune system. A healthy immune system is what keeps you from getting…
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Hives (Urticaria)
Hives (urticaria) are bumps or patches on the surface of your skin. They can be red, itchy, and swollen and…
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Human Papillomavirus (HPV)
HPV is a common sexually transmitted virus.
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Huntington's Disease
Huntington’s disease is a rare, progressive brain disorder. It gradually kills nerve cells in the brain, taking away physical and…
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Hypercoagulation
Hypercoagulation is when your blood forms a clot when it shouldn’t. This clot can then travel through your body. This…
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Hyperhidrosis
Hyperhidrosis is excessive sweating.
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Hyperparathyroidism
Hyperparathyroidism is a condition that causes you to have too much calcium in your bloodstream and not enough in your…
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Hyperthyroidism
Hyperthyroidism, or an overactive thyroid, means your thyroid gland makes too much hormone. This can cause weight loss, tremors, and…
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Hypopituitarism
Hypopituitarism is a disorder in which the pituitary gland doesn’t make enough hormones.
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Hypothermia
Hypothermia is a medical condition. It occurs when you are exposed to bitter cold for a long time and your…
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Hypothyroidism
Hypothyroidism is an underactive thyroid. Your thyroid controls your metabolism, heart rate, muscles, bones, and other organs.
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Idiopathic Thrombocytopenic Purpura (ITP)
Idiopathic thrombocytopenic purpura (ITP) is a bleeding disorder. When you have ITP, your immune system destroys the platelets in your…
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Indigestion (Dyspepsia)
Indigestion happens when your body has trouble digesting food. Anyone can get indigestion, either on occasion or as part of…
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Infant Jaundice
Infant jaundice is common. It can make your baby’s skin, eyes, and mouth turn yellow. While it may look odd,…
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Infertility
Infertility means a couple isn’t able to become pregnant after 1 year of having regular, unprotected sex. Infertility can affect…
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