An electrocardiogram, called an EKG or ECG, measures the electrical activity of the heart and collects data about heart's health. Typically, a doctor or technician places electrodes connected to a ...

Ammonia is a chemical that both occurs naturally and can be created. It is a colorless gas — one part nitrogen and three parts hydrogen — with a foul smell that most people easily recognize.

Peripheral neuropathy is a broad term for any condition that damages the peripheral nerves that transfer sensory information and carry signals from the central nervous system in the brain and spinal ...

Muscle atrophy occurs when muscle mass decreases, causing limbs and other body parts to appear smaller than normal. Atrophy can result in symptoms such as weakness, balance problems, poor coordination ...

Nabothian cysts are tiny growths that form on a woman's cervix. They are also known as cervical cysts, mucinous retention cysts, or epithelial cysts. The cervix or cervical canal connects the vagina ...

In March 1991, a team of London ophthalmologists and visual scientists discovered one-fifth of people have unequal pupil size. The condition is scientifically referred to as anisocoria and is often ...

A nodule is an abnormal tissue growth that can appear anywhere in the body and can form for various reasons. Depending on their location, nodules may not cause symptoms, and many people with nodules ...

Goosebumps occur when the arrector pili contract. These tiny muscles are attached to each hair on the body. The contractions cause a depression in the skin that pushes the hair upright and makes the ...

Some conditions are straightforward to diagnose, while others can be more challenging. Whether it is due to symptoms that overlap with other conditions or a lack of symptoms altogether, it can be ...

Barrett’s esophagus is a condition where the lining of the esophagus undergoes changes, often due to prolonged acid reflux. Over time, this chronic irritation causes the tissue to thicken and take on ...

Lymphoma is a cancer that originates in the lymphatic system, a vital part of the body’s immune defenses. This system includes lymph nodes, vessels, and tissues found in the bone marrow, spleen, ...

There are approximately 100,000 miles of blood vessels in an adult human body -- enough to circle the planet four times. The arteries and veins are an intricate network that helps the organs get the ...