Conditions

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Human immunodeficiency virus (HIV) is the virus that can lead to acquired immunodeficiency syndrome (AIDS). HIV attacks specific cells (T cells) in the immune system...


Learn more about halitosis causes and world-class treatments avaialble at the award-winning Northwell Health.


Hallux rigidus (stiff big toe) is a form of degenerative arthritis which causes pain and stiffness at the base of the big toe. Over time, the progressive condition can cause the toe to become rigid and unable to move...


A hammer toe is a condition in which the toe buckles, causing the middle joint of the affected toe to poke out. This condition is often aggravated by tight fitting shoes that put pressure on the hammer toe...


A hammer toe is a condition in which the toe buckles, causing the middle joint of the affected toe to poke out. This condition is often aggravated by tight fitting shoes that put pressure on the hammer toe. Often a corn develops at the site.


The most suitable treatment for your hand or wrist fracture is determined by a number of factors including age, present health, health history, the severity and location of the fracture, and history with other medications and treatments.


Hand and wrist fractures can make daily living difficult and cause lasting effects if not treated properly. If you think your wrist has been broken either completely or partially, it is important to seek medical attention.


Learn more about head trauma injuries, symptoms and treatments at Northwell Health.


A headache is a pain that is felt anywhere in the head or neck. Frequent headaches can affect relationships and quality of life. They may be caused by a lifestyle factor like anxiety or tension, or a more serious medical condition such as a brain tumor.


A heart attack, also known as myocardial infarction, occurs when the flow of oxygenated blood through a coronary artery to the heart suddenly becomes blocked.


Heart failure is a condition in which the heart is not strong enough to meet your body's needs, either because it can’t fill with blood or because it can’t pump with enough force. Some forms of heart failure are treated with surgery, such as valve replacements or coronary artery bypass surgery.


H. pylori is a spiral-shaped bacterium found in the stomach, which (along with acid secretion) damages stomach and duodenal tissue, causing inflammation and peptic ulcers...


Hematuria is the presence of red blood cells (RBCs) in the urine. The urine is often examined under a microscope to view evidence of RBCs. In some cases, a discoloration will be apparent and the urine will appear red or as the color of cola to the naked eye...


Learn about Hemiparesis diagnosis, symptoms, causes and treatments at Northwell Health’s Neuroscience Institute.


Hemolytic uremic syndrome (HUS) is a rare condition that primarily affects children under the age of 10. It is often characterized by: Damage to the lining of blood vessel walls Destruction of red blood cells Kidney failure Most cases of HUS occur after an infection in the digestive tract caused by the E...


There are specialized structures like blood vessels in and around the anal canal that can become swollen and irritated when extra pressure is placed on them...


Hepatitis is an inflammation of the liver that results in liver cell damage and destruction. Acute hepatitis is a type of hepatitis that is quite common in the U...


Hepatitis is an inflammation of the liver that results in liver cell damage and destruction. Hepatitis A is a type of hepatitis that is usually spread by fecal-oral contact, or fecal-infected food and water...


Hepatitis is an inflammation of the liver that results in liver cell damage and destruction. Hepatitis B (HBV) is a type of hepatitis that has a wide range of signs and symptoms...


Hepatitis is an inflammation of the liver that results in liver cell damage and destruction. Hepatitis C is a type of hepatitis that usually has mild and gradual symptoms...


Hepatitis is an inflammation of the liver that results in liver cell damage and destruction. Hepatitis D is a form of hepatitis that can occur only in the presence of hepatitis B...


Hepatitis is an inflammation of the liver that results in liver cell damage and destruction. Hepatitis E is a form of hepatitis similar to hepatitis A, in that transmission occurs through fecal-oral contamination...


Hereditary hemochromatosis is one of the most common genetic disorders in the U.S. It is a metabolic disorder that causes increased absorption of iron from the digestive tract...


When a disc is damaged, it may bulge or break open. This is called a herniated disc. It may also be called a slipped or ruptured disc.


A hiatal hernia is a common anatomical abnormality in which part of the stomach protrudes or herniates through the diaphragm and up into the chest. If the stomach gets stuck in the defect in the diaphragm, the hernia may become confined and cause severe pain in the chest and abdomen, which is a surgical emergency.


Learn more about hidradenitis suppurativa and how the dermatologists at Northwell Health treat this condition.


Also known as hypertension, high blood pressure (HBP) is the extra force of blood pushing against the inside of the blood vessels as the heart pumps, causing the heart to work harder...


A hip fracture is the complete or partial breakage of the upper thighbone, known as the proximal femur. The femur’s rounded end (known as its head) sits tightly but freely in the pelvis socket. The correct functioning of this “ball-and-socket” joint is essential for human locomotion.


Labral repair of the hip is a surgical procedure that repairs a torn labrum in the hip joint. The labrum is a ring of soft elastic tissue that follows the outside rim of the socket of your hip joint. The labrum plays a critical role in stabilizing your hip. It deepens the socket and provides a seal, or gasket, that securely holds the ball at the top of your thighbone (femur) in place.


Hip replacement is a surgical treatment that replaces a severely damaged hip joint with a prosthesis (an artificial body part).


Hirschsprung's disease occurs when some of the nerve cells that are normally present in the intestine do not form properly while a baby is developing during pregnancy...


Hodgkin lymphoma is cancer that begins in the lymph system in white blood cells called lymphocytes. When these cells become abnormal, they grow without control and may form lumps of tissue called tumors.


Learn more about what causes hordeolum, symptoms and world-class treatments available at Northwell Health.


Hormones help some types of cancer cells to grow, such as breast cancer and prostate cancer. In other cases, hormones can kill cancer cells, make cancer cells grow more slowly or stop them from growing. Hormone therapy as a cancer treatment may involve taking medications that interfere with the activity of the hormone or stop the production of the hormones. Hormone therapy may involve surgically removing a gland that is producing the hormones.


The human papillomavirus (HPV), one of the most common types of sexually transmitted infections, can cause warts and eventually lead to cancer.


The upper arm bone (the humerus) is the bone that runs between the elbow and the shoulder. Humerus fractures account for a remarkably small proportion of total bone fractures: only three percent.


Huntington’s disease (HD) is a genetic neurological disorder that causes the degeneration of nerve cells in the brain. The progression of the disease eventually results in the need for complete dependence on others for care.


Learn about hybrid atrial fibrillation ablation from the experts at The Heart Institute at Staten Island University Hospital, part of Northwell Health.


A hydrocele occurs from an accumulation of fluid in the tunica vaginalis, a thin pouch that holds the testes within the scrotum. In the fetus, the tunica vaginalis is formed in the abdomen and then moves into the scrotum with the testes...


Learn about Hydrocephalus diagnosis, symptoms, causes and treatments at Northwell Health’s Neuroscience Institute.


Hypercalcemia is an abnormally high amount of calcium in the blood and can be present with a number of symptoms depending on the area of the body that's affected and the severity of the effects...


Hypercholesterolemia is a condition characterized by high levels of cholesterol in the blood and has a variety of causes and symptoms. Cholesterol is a waxy, fat-like substance that is produced in the body and obtained from foods that come from animals (particularly egg yolks, meat, poultry, fish, and dairy products)...


Learn about hyperhidrosis diagnosis, symptoms, causes and treatments at the Northwell Health Hyperhidrosis Center.


The kidneys play a key role in keeping blood pressure in a healthy range. In turn, blood pressure can affect the health of the kidneys. High blood pressure, also called hypertension, can damage the kidneys and lead to chronic kidney disease (CKD)...


Hypoplastic left heart syndrome (HLHS) is a rare, complex, serious form of congenital heart disease in which the left ventricle (or chamber) of the heart is underdeveloped.


Hypospadias is a malformation that affects the urethral tube and the foreskin on a male's penis. The urethra is the tube that carries urine from the bladder to the outside of the body...


Hypothyroidism, or not enough thyroid hormone in the blood, causes the body’s cells to slow down their rate of metabolism. It causes exhaustion, weight gain, depression, and in severe cases severe fluid retention in the body’s tissues, a condition called myxedema that may result in a coma or death...