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Learning Center
Klippel-Trenaunay syndrome
Main signs of this congenital disorder involve a red birthmark (port-wine stain), vein malformations, and overgrowth of tissues and bones.
Klinefelter syndrome
This genetic disorder occurs when a male is born with an extra copy of the X chromosome and may result in low testosterone production and infertility.
Invasive lobular carcinoma
Breast cancer that begins in the milk-producing glands of the breast is uncommon. Learn what sets lobular carcinoma apart from other breast cancer types.
Interstitial cystitis
Bladder pain and urinary frequency flare with certain triggers if you have this condition. Learn about treatments and self-care.
Inherited metabolic disorders
Caused by gene changes, these disorders affect the body's ability to change food into energy. They also affect how energy is used, such as for cell repair.
Inflammatory breast cancer
Learn about this rare, aggressive type of breast cancer that causes a swollen breast. Treatments include surgery, radiation, chemotherapy and others.
Infectious diseases
Viruses, bacteria, fungi and parasites can all cause infection. Find out more about how to prevent and treat these conditions.
Infant reflux
Learn more about when a baby spits up food or liquid. Most babies outgrow this common and messy condition by the age of 18 months.
Infant jaundice
Learn about this common condition in newborns, especially those born preterm. With close monitoring and light therapy, complications are rare.
Incompetent cervix
Sometimes the cervix opens and thins early, putting a pregnancy at risk. Learn more about this hard-to-diagnose condition.
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