In-depth

 

Antiphospholipid syndrome is a rare disorder in which your immune system attacks certain blood proteins, creating clotting abnormalities that can cause stroke and pregnancy complications.

Acromegaly

Acromegaly is an uncommon hormonal disorder caused by the overproduction of growth hormone. It typically causes signs such as enlarged hands and feet.

Acute sinusitis

Acute sinusitis occurs when your sinus cavities become inflamed. Antibiotics, decongestants and corticosteroids may relieve pain and congestion and prevent development of chronic sinusitis.

Alcohol intolerance

Think you have alcohol intolerance? Here's what might be causing your reaction to wine, beer or other beverages.

Amenorrhea

Although the absence of menstruation (amenorrhea) is seldom serious, the condition can often be linked to an underlying problem requiring treatment.

Aplastic anemia

Aplastic anemia occurs when your bone marrow stops producing enough new blood cells. It's a serious problem, but treatments are available.

Astigmatism

Many people have astigmatism, an irregular curvature of the eye's surface that can cause blurred vision. Treatments include corrective lenses and laser surgery.

Bee stings

Bee stings — Comprehensive overview covers prevention, treatment of bee stings.

Behcet's disease

Behcet's disease affects several body systems and causes a variety of signs and symptoms. Find out what it is and how it's treated.

Bell's palsy

Bell's palsy occurs when an impaired nerve results in facial weakness or paralysis. Most people experience a full recovery.

Brucellosis

Brucellosis is an infectious disease that spreads from animals to people, mainly via unpasteurized dairy products. Travelers should take special care to avoid infection.

Carbon monoxide poisoning

Carbon monoxide is a colorless, odorless gas. But the danger it poses is real. Consider simple tips to prevent carbon monoxide poisoning.

Chiari malformation

Chiari malformation is an uncommon condition in which brain tissue extends into the spinal canal, causing headaches and other potentially serious symptoms.

Child abuse

If a child tells you he or she is being abused, take the situation seriously. Here's how to respond.

Chronic sinusitis

Chronic sinusitis involves long-term inflammation or infection of the sinus cavities. Medications can help, and in rare cases surgery can treat this painful condition.

Coarctation of the aorta

Coarctation of the aorta is a cardiovascular defect resulting in a narrowing of the aorta, the blood vessel that delivers oxygen-rich blood to your body.

Cold sore

Cold sores are common and annoying. You can't cure or prevent them, but you can take steps to lessen their frequency and duration.

Common cold

You've got a cold, or you're trying to prevent getting one. Here are some timely tips.

Concussion

Concussions can be serious injuries that need sufficient time to heal.

Cough headaches

Cough headaches — so named because they're triggered by coughing — are sometimes harmless, but they may be a symptom of a serious condition.

Cushing syndrome

Cushing syndrome is caused by an excess of the hormone cortisol, originating from your adrenal glands or from corticosteroid medications you're taking for another illness.

Dehydration

You normally lose about 10 cups (2.4 liters) of water every day — much more during exercise or illness. Learn how to stay hydrated.

Depression

Take control of your mood and health. Explore the many depression treatment options and learn coping skills.

Ear infection (middle ear)

Ear infections are common in children. These bacterial or viral infections of the middle ear can cause mild to severe ear pain.

Ebola virus and Marburg virus

Ehrlichiosis

Ehrlichiosis is a tick-borne disease that causes flu-like symptoms. When you're outdoors, be aware of steps to prevent tick bites.

Eisenmenger syndrome

Eisenmenger syndrome, a complication of congenital heart defects, can be life-threatening if not properly treated. Find out more.

Encephalitis

Encephalitis is inflammation of the brain usually caused by a viral infection. Severe cases can cause brain damage, even death.

Essential thrombocythemia

Essential thrombocythemia is an uncommon blood disorder in which your body makes too many platelets, which can cause abnormal blood clotting or bleeding.

Exercise headaches

You know exercise is good for you. But did you know that exertion can leave you with a pounding headache?

External compression headaches

External compression headaches are caused by tight head wear, such as goggles or helmets. To treat the headaches, simply remove the head wear.

Eyestrain

Reduce eyestrain by following these simple tips.

Farsightedness

With farsightedness (hyperopia) you can see objects in the distance clearly, but objects nearby are blurry. It's easily corrected with eyeglasses or contact lenses.

Fever

Don't be in a hurry to treat a low-grade fever — it's probably helping your body fight infection. High or lasting fevers may need medical attention.

Fibromuscular dysplasia

Fibromuscular dysplasia is a rare, but treatable, condition in which the arteries to your kidneys, brain or abdomen narrow, reducing blood flow to your organs.

Fibromyalgia

Fatigue and widespread pain are common with fibromyalgia, a condition affecting mainly women. Treatment often focuses on managing symptoms with medication and self-care.

Galactorrhea

Galactorrhea is a milky discharge from the nipple not associated with the normal milk production of breast-feeding.

Giant cell arteritis

Giant cell arteritis causes inflammation in your arteries, particularly those in your head. Early treatment often relieves symptoms and prevents vision loss, a serious complication.

Hangovers

Hangovers are the unwelcome result of drinking too much alcohol. However unpleasant, most hangovers go away on their own within eight to 24 hours.

Hantavirus pulmonary syndrome

Hantavirus pulmonary syndrome is initiated by a rodent-carried virus that infects the lung tissues, bringing on flu-like symptoms, respiratory problems and even death.

Headaches in children

Children of all ages experience headaches, but the causes aren't all the same. Here's how to help your child.

Heat exhaustion

Heat exhaustion occurs when your body overheats, usually as a result of hot, humid weather. It's preventable, but can be dangerous if not treated.

Histoplasmosis

The fungus that causes the lung disease histoplasmosis lurks in soil, chicken coops and caves. Find out if you're at risk.

HIV/AIDS

More than 39 million people are living with HIV — the virus that causes AIDS. Millions more are likely to become infected in the next decade.

Hyperglycemia in diabetes

Hyperglycemia in diabetes — Comprehensive overview covers causes, symptoms and treatments of high blood sugar.

Hyponatremia

Impacted wisdom teeth

Impacted wisdom teeth don't have room to emerge or grow normally. Learn about dental problems related to impacted wisdom teeth and your treatment options.

Influenza (flu)

Intermittent explosive disorder

Intermittent explosive disorder involves aggressive, violent behavior that's out of proportion to what triggered the behavior. Episodes may be separated by long periods of time.

Iron deficiency anemia

Iron deficiency anemia may leave you feeling sapped of energy. This condition is especially common in women. Iron supplements usually help.

Legionnaires' disease

Legionnaires' disease, a severe form of pneumonia, is caused by bacteria that can live in water in air conditioning systems, showers and spas.

Listeria infection

Most people exposed to listeria don't become ill. But for those at risk of a listeria infection — a foodborne illness — the consequences can be severe.

Lung cancer

Smoking increases your risk of lung cancer. Quit now and reduce your risk.

Lyme disease

Lyme disease is a tick-borne illness. Left untreated, it can lead to serious and lingering complications — including arthritis.

Malaria

Malaria is one of the oldest diseases on Earth and is still one of the leading killers.

Meningitis

Fever, headache and stiff neck are common signs and symptoms of meningitis — an infection of the membranes and fluid surrounding the brain and spinal cord.

Migraine

A migraine isn't an ordinary headache. In addition to severe head pain, it can cause nausea, vomiting, and extreme sensitivity to light and sound.

Mononucleosis

Mononucleosis — also called kissing disease because it can be spread by kissing — causes fatigue, fever and swollen lymph glands.

Myocarditis

Myocarditis is a disease in which the heart muscle becomes inflamed and swollen, often as the result of an infection.

Naegleria infection

Summertime freshwater swimming may put you at risk of this rare but often fatal infection. Learn more about your risks and how to protect yourself.

Nasal polyps

Nasal polyps, inflammation-related growths in the nasal passages or sinuses, can block the flow of air and fluid in your nose.

Nasopharyngeal carcinoma

Nasopharyngeal carcinoma is rare in the United States but more common in some other parts of the world.

Nearsightedness

Nearsightedness allows you to see objects near to you clearly, but objects farther away look blurry. It's easily corrected with eyeglasses or contact lenses.

Paget's disease of bone

Your bones are made up of living tissue that's continually being renewed. Paget's disease of bone disrupts that process, sometimes causing serious complications.

Panic attacks

Panic attacks can make you feel like you're having a heart attack. Learn how to manage these intense bursts of fear.

Parvovirus infection

Parvovirus infection is a common childhood illness with a distinctive cheek rash. In some adults, including some pregnant women, it can be serious.

Pituitary tumors

Pituitary tumors are abnormal growths in the pituitary gland in the brain. Most are noncancerous (benign). Some may cause overproduction of hormones and associated problems.

Plague

Plague is a disease carried by rats and other rodents. The risk of developing plague is low, and most cases occur in Africa.

Pneumonia

There are at least 50 kinds of pneumonia — a serious lung infection that takes the lives of more than 60,000 Americans every year.

Polio

One of the most feared diseases of the 20th century, polio has been eradicated from the developed world but remains a threat in less developed nations.

Polycythemia vera

Polycythemia vera is a rare blood disorder in which a person's bone marrow makes too many blood cells.

Polymorphous light eruption

Polymorphous light eruption is a sun-induced skin rash affecting people who develop a sensitivity to sunlight.

Post-concussion syndrome

Postpartum preeclampsia

Postpartum preeclampsia — Comprehensive overview covers symptoms and treatment of this post-pregnancy condition.

Premenstrual syndrome (PMS)

Premenstrual syndrome (PMS) can make you miserable in the days before your monthly period. Here's how to handle it — bloating, depression and all.

Presbyopia

Prolactinoma

Prolactinoma is a tumor in the pituitary gland that causes overproduction of the hormone prolactin. Too much prolactin can cause infertility or sexual dysfunction.

Pseudotumor cerebri

Pseudotumor cerebri — Comprehensive overview covers symptoms, causes, treatment of increased pressure inside the skull.

Rabies

Rabies is a serious infection that usually spreads through the bite of an animal infected with the virus.

Radiation sickness

Radiation sickness is the effect of high doses of radiation on the body. The severity of illness depends on how much radiation the body absorbs.

Rocky Mountain spotted fever

Rubella

Rubella, a contagious viral infection, is most dangerous to pregnant women. Rubella can be prevented with the combined measles-mumps-rubella vaccine.

Salmonella infection

Salmonella infection will cause only diarrhea and stomach pain in some people, but for infants and immunocompromised people, this bacterial illness can cause life-threatening complications.

Scarlet fever

Scarlet fever is a bacterial infection that causes a rash, fever and sore throat and usually affects children and adolescents.

Serotonin syndrome

Serotonin syndrome — caused by mixing some antidepressants and other medications — can be life-threatening if left untreated.

Shingles

Vaccination may prevent this painful, but treatable, condition. Learn about shingles symptoms and how treatments can help.

Sleep apnea

Sleep apnea causes people to repeatedly stop breathing during their sleep. Common signs of this sleep disorder include loud snores punctuated by periods of silence.

Sleep apnea, central

Central sleep apnea is an uncommon condition that occurs when your brain has problems controlling your breathing during sleep.

Sleep apnea, obstructive

Obstructive sleep apnea is the most common type of sleep apnea — a condition that causes you to repeatedly stop breathing while you sleep.

Smallpox

Strep throat

Strep throat is a bacterial throat infection. It typically causes a very sore throat and is treated with antibiotics.

Stroke

Stroke occurs when the blood supply to part of your brain is interrupted, depriving brain tissue of oxygen and nutrients. Stroke is a medical emergency.

Sunburn: Soothing solutions

Swine flu (H1N1 flu)

Swine flu — Comprehensive overview covers swine flu symptoms, tests, treatment and prevention.

Takayasu's arteritis

Takayasu's arteritis is an uncommon form of vasculitis that affects the large arteries.

Teen depression

All teens feel down from time to time. But if negative feelings persist or start to interfere with daily life, it might be depression.

Tension headache

A tension headache is the most common form of headache. A number of treatments are available to help you deal with the pain.

Thrombocytosis

Thrombocytosis is a disorder in which your body makes too many platelets. Treatment depends on the underlying cause.

Thunderclap headaches

Thunderclap headaches strike suddenly. Immediate medical attention is essential. Some thunderclap headaches signal a life-threatening condition.

TMJ disorders

TMJ disorders are painful conditions centered where your jawbone attaches to your skull. The pain may be temporary or chronic.

Tonsillitis

Tonsillitis — a common cause of sore throat in children — is usually treated with self-care and, in some cases, antibiotics.

Traumatic brain injury

While mild traumatic brain injury generally results in few long-term problems, more severe injury can cause several physical, emotional, behavioral, communication and cognitive problems.

Trichinosis

Trichinosis is a roundworm infection you get from eating undercooked, infected pork or other meats. Medications can eliminate the parasite and treat symptoms.

Tularemia

Tularemia is a rare, highly infectious disease spread by insects and wild animals. Landscapers, hunters and laboratory workers are especially at risk.

Typhoid fever

Although rare in industrialized nations, typhoid fever is a serious threat in many parts of the world. Learn how to stay safe when you travel.

Valley fever

Valley fever — This common fungal infection in America's desert regions causes few, if any, problems for most people, but for some it can be life-threatening.

West Nile virus

West Nile virus infection usually resolves on its own, but occasionally it can be serious.

Whiplash

Whiplash is a neck injury often linked to auto accidents. Discover which treatments work and which don't.

Jun. 04, 2013