Diseases & conditions A-Z List
Diseases & Conditions A-Z List - «A»:
An appendectomy is surgery to remove the appendix.
See also: Appendicitis
The appendix is a small, finger-shaped organ extending from the first part of the large intestine. It is removed when it becomes inflamed or infected. A perforated appendix can leak and infect the entire abdomina...
Appendicitis is inflammation of the appendix. The appendix is a small pouch attached to the beginning of your large intestine.
Appendicitis is one of the most common causes of emergency abdominal surgery in the United States. It usually occurs when the appendix becomes blocked by feces, a fo...
Appetite - decreased
A decreased appetite is when you have a reduced desire to eat. The medical term for a loss of appetite is anorexia.
Any illness can affect a previously hearty appetite. If the illness is treatable, the appetite should return when the condition is cured.
Loss of appetite can cause uni...
Appetite - increased
Increased appetite means you have an excess desire for food.
An increased appetite can be a symptom of different diseases. For example, it may be due to certain mental conditions and endocrine gland disorders.
An increased appetite can come and go (intermittent), or it can last for l...
Appropriate for gestational age (AGA)
Appropriate for gestational age (AGA) describes a fetus or newborn infant whose size is within the normal range for his or her gestational age.
Assigning size is a way to measure and monitor the growth of the infant throughout the pregnancy as well as at the time of birth.
Apraxia is a disorder of the brain and nervous system in which a person is unable to perform tasks or movements when asked, even though:
The request or command is understood
They are willing to perform the task
The muscles needed to perform the task work properly
The task may have already been lear...
Arachnodactyly is a physical condition in which the fingers are long, slender, and curved, resembling a spider's legs.
Long, slender fingers can be normal and not associated with any medical problems. In some cases, however, spider fingers can be a sign of an underlying disease.
Arm CT scan
A computed tomography (CT) scan of the arm is an imaging method that uses x-rays to create cross-sectional pictures of the arm.
How the Test is Performed
You will be asked to lie on a narrow table that slides into the center of the CT scanner. The arm being scanned will be held still with small foa...
Arm MRI scan
A magnetic resonance imaging (MRI) scan of the arm is a noninvasive method to create detailed pictures of the upper and lower arm, including the elbow, wrist, hands, fingers, and the surrounding muscles and other tissues.
Unlike x-rays and computed tomographic (CT) scans, which use radiation, MRI us...
An armpit lump refers to enlargement of one or more lymph nodes under the arm.
Lumps in the armpit have various causes. Cysts and infections on the surface of the skin of the armpit may be caused by shaving or use of antiperspirants (as opposed to deodorants). This occurs most freque...
Arrhenoblastoma of ovary
Arrhenoblastoma of the ovary is an ovarian tumor that releases the male hormone, testosterone, or other hormones.
See also: Sertoli-Leydig cell tumor
This is a rare tumor. It accounts for less than 0.5% of all ovarian tumors.
These tumors are found in women of all age groups, but are most c...
An arrhythmia is a disorder of the heart rate (pulse) or heart rhythm, such as beating too fast (tachycardia), too slow (bradycardia), or irregularly.
Normally, your heart is able to pump blood out to your body without working any harder than is needed.
To help this happen, your heart has a...
Arterial embolism is a sudden interruption of blood flow to an organ or body part due to a clot (embolus).
An embolus is a blood clot or a piece of plaque that acts like a clot. Emboli means more than one clot. If the clot travels from the site where it formed to another location in the body...
Arterial insufficiency is a lack of enough blood flow through the arteries.
Coronary artery disease
Mesenteric artery ischemia
Peripheral artery disease
One of the most common causes of arterial insufficiency is atheroscle...
An arterial stick is the collection of blood from an artery for laboratory testing.
How the Test is Performed
Usually the blood is drawn from the wrist. However, it may also be drawn from the inside of the elbow, groin, or other artery. A heartbeat (pulse) is felt by pressing on the area above an a...