English textbooks

What is clubfoot in children? Clubfoot is a deformity of the foot. It’s when one or both feet are turned inward. The condition affects the bones, muscles, tendons, and blood vessels. Clubfoot is present at birth. It tends to affect…

What is a cluster headache? Cluster headaches are rare when compared with other types of headaches. The pain they cause is severe and tends to recur in the same way each time. They occur in groups, or clusters. Each attack…

What is CMV? Cytomegalovirus (CMV) is a type of virus that is related to the virus that causes herpes. Like many other viruses, CMV can invade human cells. It can then use those cells to reproduce and spread. If the…

What is coarctation of the aorta in children? Coarctation of the aorta (COA) is a heart defect that is present at birth (congenital). It means the aorta is narrower than it should be. The aorta is the large artery that carries…

What is coarctation of the aorta transcatheter dilation? Coarctation of the aorta is an abnormal narrowing of the aorta. The aorta is the large blood vessel that exits the heart and supplies the body with oxygen-rich blood. Transcatheter dilation is…

Does this test have other names? Cocaine drug test, toxicology screen, tox screen, substance abuse test, drug-of-abuse test What is this test? A cocaine screen is a test done to find out whether you have used cocaine recently. The test…

What is cochlear implant surgery? If a person has severe hearing loss, a cochlear implant may help. A cochlear implant is different from a hearing aid. A hearing aid makes sounds louder and helps someone who has some hearing loss.…

What are cold sores? Cold sores are small blisters around the mouth. They are also called fever blisters. They are caused by the herpes simplex virus. The most common strain of the virus causing cold sores is herpes simplex virus 1. It…

Cold vs. Allergy in Children: How to Tell the Difference

Cryotherapy literally means cold therapy. When you press a bag of frozen peas on a swollen ankle or knee, you are treating your pain with a modern (although basic) version of cryotherapy. Cold therapy can be applied in different ways.…

What is a colectomy? Being diagnosed with a disease of the colon (also called the bowel or large intestine) can be scary. To take charge of your health, try to learn as much as you can about your treatment options.…

What is colic? Colic is when a healthy baby cries for a very long time for no obvious reason. It is most common during the first 6 weeks of life. It usually goes away on its own by age 3…