A middle ear infection occurs behind the eardrum. It is most often caused by a virus or bacteria. Most kids have at least 1 middle ear infection by the time they are 3 years old. But adults can also get them.

Acupuncture is the practice of putting thin needles into the skin at certain parts of the body. It's done to ease symptoms linked to many diseases. Read on to learn more.

A peak flow meter for asthma is like a thermometer for a fever - it helps you keep track of what's going on inside your lungs by measuring airflow out of the lungs.

A food allergy is when your body has a bad immune reaction to a certain food. This is different than a food intolerance, which does not affect the immune system. Read on to learn more.

Polycythemia vera is a rare blood disorder in which there is an increase in all blood cells, particularly red blood cells. The increase in blood cells makes your blood thicker. This can lead to strokes or tissue and organ damage.

Chemotherapy can cause bruising or bleeding. Whether it happens depends on the type and dose of chemotherapy you're getting.

Apnea is a term that means breathing has stopped for more than 20 seconds. It can happen in full-term babies, but it is more common in premature babies. The more premature the baby, the greater the chances that apnea will occur.

Low birth weight is a term used to describe babies who are born weighing less than 5 pounds, 8 ounces (2,500 grams). An average newborn usually weighs about 8 pounds. A low-birth-weight baby may be healthy even though they are small. But a low-birth-weight baby can also have many serious health problems.

Because most babies in the NICU are too small or sick to take milk feedings, medicines and fluids are often given through their veins or arteries.

Hypocalcemia is when a person doesn't have enough calcium in the blood. In babies, it’s called neonatal hypocalcemia. Your baby can get it at different times and from different causes.