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Gallstones
Gallstones are hardened deposits that form inside the gallbladder, a small organ that stores bile to help digest fat. Some stones cause…
Genital Warts
Genital warts are growths caused by certain types of human papillomavirus (HPV). They can affect the genitals, anus, or nearby skin and…
Gigantism
Gigantism is a rare growth disorder that causes unusually rapid and excessive height gain during childhood. It develops when the body produces…
Glaucoma
Glaucoma is a group of eye diseases that damage the optic nerve, which carries visual information from the eye to the brain.…
Graft Disease
Graft disease usually refers to graft-versus-host disease (GVHD), a complication that can occur after an allogeneic stem cell or bone marrow transplant.…
Hashimoto Thyroiditis
Hashimoto thyroiditis is an autoimmune condition in which the immune system mistakenly attacks thyroid tissue. Over time, this inflammation and damage can…
Heart Failure
Heart failure means the heart cannot pump or fill well enough to meet the body's needs. As a result, the body may…
Heat Exhaustion
Heat exhaustion is a heat-related illness that develops when the body cannot cool itself effectively. Excessive heat, sweating, and fluid loss can…
Hemochromatosis
Hemochromatosis is a condition in which the body absorbs too much iron from food and stores it in tissues and organs. Inherited…
Hyperopia
Hyperopia, also called farsightedness or hypermetropia, is a refractive error in which light focuses behind the retina instead of directly on it.…
Hyperparathyroidism
Hyperparathyroidism occurs when one or more of the four parathyroid glands make too much parathyroid hormone. This hormone helps control calcium levels,…
Hypertension
Hypertension, also called high blood pressure, means that pressure remains higher than healthy levels inside the arteries. It can affect adults of…
Hyperthyroidism
Hyperthyroidism occurs when the thyroid gland makes too much thyroid hormone, causing many body processes to speed up. It can lead to…
Interstitial Cystitis
Interstitial cystitis, also called bladder pain syndrome, is a chronic condition that causes bladder or pelvic pain along with urinary symptoms. Symptoms…
Juvenile Idiopathic Arthritis
Juvenile idiopathic arthritis (JIA) is a group of inflammatory arthritis conditions that begin before age 16. It causes ongoing inflammation in one…
Kidney Cancer
Kidney cancer begins when abnormal cells grow out of control in kidney tissue. Renal cell carcinoma is the most common type in…
Kidney Disease
Kidney disease is a broad term for damage or reduced function in one or both kidneys. Healthy kidneys filter waste and extra…
Leukemia
Leukemia is a cancer that begins in blood-forming tissues, especially the bone marrow. It causes abnormal blood cells to grow or survive…
Liver Cancer
Liver cancer is a disease in which abnormal cells grow uncontrollably in the liver and form a tumor. It can affect people…
Lung Cancer
Lung cancer begins when abnormal cells in lung tissue grow uncontrollably and form a tumor. It can affect people who smoke, people…
Lymphangitis
Lymphangitis is inflammation and infection of one or more lymphatic vessels, which help move fluid and immune cells through the body. It…
Lymphoma
Lymphoma is a cancer that starts in lymphocytes, a type of white blood cell in the lymphatic system. This system includes lymph…
Macular Degeneration
Macular degeneration is an eye disease that damages the macula, the central part of the retina responsible for sharp, detailed vision. It…
Malaria
Malaria is an illness caused by Plasmodium parasites that infect red blood cells. Infected female Anopheles mosquitoes can transmit the parasites when…
