Featured Content
Featured Content
Answering Common Questions About Temporomandibular Disorders
If you’re getting headaches, feel soreness when you chew, or hear clicking when you move your jaw, you may be suffering from a temporomandibular disorder(TMD). There are many kinds of TMDs,...
What is Fatty Liver? 4 Things Patients Should Know
There are plenty of health conditions out there with obscure, hard-to-pronounce medical names. Then there’s fatty liver, an unsettling term that frightens many patients. Fatty liver includes...
4 Things to Know Before Starting – or Stopping – a Dietary Supplement
Are dietary supplements effective? Are nutritional supplements safe?Those are complicated questions without easy answers. There are so many products and substances that fall into the dietary...
Heatstroke
Heatstroke is a life-threatening condition that results in very high body temperature and malfunction of many organ systems, which may be fatal. (See also Overview of Heat Disorders.) Heatstroke...
Merck Manuals Celebrates 125th Anniversary
First published in 1899, what started as a pocket-sized book for physicians and pharmacists has since transformed into a comprehensive digital medical reference for physicians and consumers alike. As Merck Manuals celebrates its 125th anniversary, it continues to uphold its commitment to providing accurate and trustworthy medical information.
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Test Your Knowledge
View AllCataract
Which one of the following descriptions of adverse eye conditions best describes cataract?
- A condition in which light rays entering the eye are not focused on the retina, causing blurred vision.
- Progressive optic nerve damage that leads to progressive loss of vision usually occurs because of increased pressure in the eye.
- A clouding (opacity) of the lens of the eye that causes a progressive, painless loss of vision
- A condition that causes progressive damage to the macula, the central and most vital area of the retina, resulting in gradual loss of central vision.
DID YOU KNOW...
DID YOU KNOW...
Enlarged Tonsils and Adenoids in Children
Removing enlarged tonsils and adenoids is useful when enlargement causes extreme discomfort, breathing problems, or recurring infections.
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Important: The authors, reviewers, and editors of this material have made extensive efforts to ensure that treatments, drugs, and discussions about medical practice are accurate and conform to the standards accepted at the time of publication. However, constant changes in information resulting from continuing research and clinical experience, reasonable differences in opinions among authorities, unique aspects of individual clinical situations, and the possibility of human error in preparing such an extensive text mean that other sources of medical information may differ from the information on this site. The information on this site is not intended to be professional advice and is not intended to replace personal consultation with a qualified physician, pharmacist, or other health care professional. The reader should not disregard medical advice or delay seeking it because of something found on this site.
