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 is an uncommon hormonal disorder caused by the overproduction of growth hormone. It typically causes signs such as enlarged hands and feet.
Acute sinusitis occurs when your sinus cavities become inflamed. Antibiotics, decongestants and corticosteroids may relieve pain and congestion and prevent development of chronic sinusitis.
Think you have alcohol intolerance? Here's what might be causing your reaction to wine, beer or other beverages.
Although the absence of menstruation (amenorrhea) is seldom serious, the condition can often be linked to an underlying problem requiring treatment.
Anemia occurs in many forms, but all involve a shortage of healthy red blood cells. Treatment depends on what's causing your anemia.
Aplastic anemia occurs when your bone marrow stops producing enough new blood cells. It's a serious problem, but treatments are available.
Aspergillosis is a group of illnesses caused by a common mold. It mainly affects people with a weakened immune system, another lung disease or asthma.
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 — Comprehensive overview covers prevention, treatment of bee stings.
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 occurs when an impaired nerve results in facial weakness or paralysis. Most people experience a full recovery.
A brain aneurysm is a bulge in an artery in the brain. A ruptured aneurysm causes bleeding in the brain and potentially fatal cell damage.
Brucellosis is an infectious disease that spreads from animals to people, mainly via unpasteurized dairy products. Travelers should take special care to avoid infection.
Bruxism is the medical term for teeth grinding or clenching, especially during sleep or times of stress. Left untreated, it can damage your teeth.
Carbon monoxide is a colorless, odorless gas. But the danger it poses is real. Consider simple tips to prevent carbon monoxide poisoning.
Carotid artery disease narrows blood vessels leading to your brain and is a common risk factor for stroke.
Chagas disease, a condition caused by a parasite, usually is transmitted to humans through feces of the infected triatomine bug.
Chiari malformation is an uncommon condition in which brain tissue extends into the spinal canal, causing headaches and other potentially serious symptoms.
If a child tells you he or she is being abused, take the situation seriously. Here's how to respond.
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 is a cardiovascular defect resulting in a narrowing of the aorta, the blood vessel that delivers oxygen-rich blood to your body.
Cold sores are common and annoying. You can't cure or prevent them, but you can take steps to lessen their frequency and duration.
You've got a cold, or you're trying to prevent getting one. Here are some timely tips.
Concussions can be serious injuries that need sufficient time to heal.
Children whose eyes don't turn inward properly to focus on close objects may have trouble reading. But eye exercises may improve the condition.
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 is caused by an excess of the hormone cortisol, originating from your adrenal glands or from corticosteroid medications you're taking for another illness.
You normally lose about 10 cups (2.4 liters) of water every day — much more during exercise or illness. Learn how to stay hydrated.
Dengue fever is a sometimes fatal viral disease spread by mosquitoes in tropical and subtropical areas of the world. Learn how to protect yourself.
Take control of your mood and health. Explore the many depression treatment options and learn coping skills.
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 viruses cause hemorrhagic fevers, serious and potentially life-threatening illnesses.
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, a complication of congenital heart defects, can be life-threatening if not properly treated. Find out more.
Encephalitis is inflammation of the brain usually caused by a viral infection. Severe cases can cause brain damage, even death.
Essential thrombocythemia is an uncommon blood disorder in which your body makes too many platelets, which can cause abnormal blood clotting or bleeding.
You know exercise is good for you. But did you know that exertion can leave you with a pounding headache?
External compression headaches are caused by tight head wear, such as goggles or helmets. To treat the headaches, simply remove the head wear.
Reduce eyestrain by following these simple tips.
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.
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 is a rare, but treatable, condition in which the arteries to your kidneys, brain or abdomen narrow, reducing blood flow to your organs.
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 is a milky discharge from the nipple not associated with the normal milk production of breast-feeding.
Genital herpes is a highly contagious sexually transmitted infection. The sores associated with the disease go through cycles of outbreaks and healing.
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.
A grand mal seizure is characterized by loss of consciousness and convulsions.
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 is initiated by a rodent-carried virus that infects the lung tissues, bringing on flu-like symptoms, respiratory problems and even death.
Children of all ages experience headaches, but the causes aren't all the same. Here's how to help your child.
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.
Heatstroke is the dangerous escalation of two other heat-related conditions, heat cramps and heat exhaustion. Seek immediate medical attention if you have this condition.
Hemophilia occurs when your body lacks one of several clot-forming proteins called clotting factors. The result is prolonged bleeding, which can be life-threatening.
The fungus that causes the lung disease histoplasmosis lurks in soil, chicken coops and caves. Find out if you're at risk.
More than 39 million people are living with HIV — the virus that causes AIDS. Millions more are lipkely to become infected in the next decade. 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.
A hydrocele is a generally harmless fluid-filled sac that surrounds a testicle, causing scrotal swelling. However, it may indicate a more serious condition.
Hyperglycemia in diabetes — Comprehensive overview covers causes, symptoms and treatments of high blood sugar.
Hyperparathyroidism, or overactivity of one or more parathyroid glands, raises blood-calcium levels. The disorder can weaken bones and lead to other serious complications.
Hyponatremia is an abnormally low concentration of sodium in the blood. One cause is drinking too much water.
Hypoparathyroidism is a disorder in which your parathyroid glands secrete abnormally low levels of parathyroid hormone, causing symptoms such as muscle aches.
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.
Don't let the flu set you back. Find out how to protect yourself from getting sick with the flu.
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.
Intracranial hematoma occurs when a blood vessel ruptures between your skull and brain or within your brain.
Iron deficiency anemia may leave you feeling sapped of energy. This condition is especially common in women. Iron supplements usually help.
With warm weather, the water's fine for swimmers — and also for jellyfish. Here's how to keep them from spoiling your time at the beach.
Even small amounts of lead in the body can cause serious health problems. Reducing exposure is essential, especially for infants and young children.
Legionnaires' disease, a severe form of pneumonia, is caused by bacteria that can live in water in air conditioning systems, showers and spas.
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.
Smoking increases your risk of lung cancer. Quit now and reduce your risk.
Lupus is a chronic disease that can affect your skin, joints and organs. With proper care, most people with lupus live relatively active, healthy lives.
Lyme disease is a tick-borne illness. Left untreated, it can lead to serious and lingering complications — including arthritis.
Malaria is one of the oldest diseases on Earth and is still one of the leading killers.
Seizures, headaches and memory loss can be the troubling symptoms of this slow-growing tumor. Find out more.
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.
There are more than 200 types of mental illnesses. Learn about risk factors, symptoms, treatments and coping.
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 — also called kissing disease because it can be spread by kissing — causes fatigue, fever and swollen lymph glands.
Myocarditis is a disease in which the heart muscle becomes inflamed and swollen, often as the result of an 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, inflammation-related growths in the nasal passages or sinuses, can block the flow of air and fluid in your nose.
Nasopharyngeal carcinoma is rare in the United States but more common in some other parts of the world.
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.
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 can make you feel like you're having a heart attack. Learn how to manage these intense bursts of fear.
Parvovirus infection is a common childhood illness with a distinctive cheek rash. In some adults, including some pregnant women, it can be serious.
A pheochromocytoma is a rare adrenal gland tumor that can produce large amounts of certain hormones and seriously raise blood pressure.
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 is a disease carried by rats and other rodents. The risk of developing plague is low, and most cases occur in Africa.
There are at least 50 kinds of pneumonia — a serious lung infection that takes the lives of more than 60,000 Americans every year.
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.
Polycystic kidney disease causes clusters of cysts to form in your kidneys. High blood pressure and kidney failure are common complications of this disorder.
Polycythemia vera is a rare blood disorder in which a person's bone marrow makes too many blood cells.
Polymorphous light eruption is a sun-induced skin rash affecting people who develop a sensitivity to sunlight.
Post-concussion syndrome is a complex disorder in which concussion symptoms — such as headaches and dizziness — can last for more than a year.
Postpartum preeclampsia — Comprehensive overview covers symptoms and treatment of this post-pregnancy condition.
Preeclampsia is a pregnancy complication defined by high blood pressure and excess protein in your urine. The only cure is delivery of your baby.
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 is an age-related change in vision that usually makes it difficult to focus and see things close up. Several treatment options are available.
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 — Comprehensive overview covers symptoms, causes, treatment of increased pressure inside the skull.
Pulmonary edema occurs when air sacs in the lungs fill with fluid. It's often a life-threatening emergency.
Q fever is a rare bacterial infection causing flu-like symptoms and sometimes harmful consequences. Most at risk are those who work with farm animals.
Rabies is a serious infection that usually spreads through the bite of an animal infected with the virus.
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.
Recurrent breast cancer — Comprehensive overview covers symptoms, diagnosis and treatment for breast cancer recurrence.
Respiratory syncytial virus (RSV) infects most children by age 2. Signs and symptoms of the virus typically mimic a cold, but it can be serious.
Rocky Mountain spotted fever is a potentially serious bacterial infection transmitted to humans by tick bites. Prompt medical treatment is necessary.
Rubella, a contagious viral infection, is most dangerous to pregnant women. Rubella can be prevented with the combined measles-mumps-rubella vaccine.
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 is a bacterial infection that causes a rash, fever and sore throat and usually affects children and adolescents.
Serotonin syndrome — caused by mixing some antidepressants and other medications — can be life-threatening if left untreated.
Vaccination may prevent this painful, but treatable, condition. Learn about shingles symptoms and how treatments can help.
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.
Central sleep apnea is an uncommon condition that occurs when your brain has problems controlling your breathing during sleep.
Obstructive sleep apnea is the most common type of sleep apnea — a condition that causes you to repeatedly stop breathing while you sleep.
Smallpox, one of the oldest and most devastating of human diseases, was eradicated worldwide by 1980.
The bacteria that cause staph infections are everywhere, including on your skin and in your nose. Learn how to protect yourself from these potentially dangerous germs.
Strep throat is a bacterial throat infection. It typically causes a very sore throat and is treated with antibiotics.
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.
Long hours in the sun and unprotected skin mean one thing: sunburn. Here's what you can do for comforting sunburn relief.
Swine flu — Comprehensive overview covers swine flu symptoms, tests, treatment and prevention.
Takayasu's arteritis is an uncommon form of vasculitis that affects the large arteries.
All teens feel down from time to time. But if negative feelings persist or start to interfere with daily life, it might be depression.
A tension headache is the most common form of headache. A number of treatments are available to help you deal with the pain.
Thrombocytosis is a disorder in which your body makes too many platelets. Treatment depends on the underlying cause.
Thunderclap headaches strike suddenly. Immediate medical attention is essential. Some thunderclap headaches signal a life-threatening condition.
TMJ disorders are painful conditions centered where your jawbone attaches to your skull. The pain may be temporary or chronic.
Tonsillitis — a common cause of sore throat in children — is usually treated with self-care and, in some cases, antibiotics.
Toxic shock syndrome is a life-threatening infection often associated with the use of superabsorbent tampons. But it can also occur in men and children.
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 is a roundworm infection you get from eating undercooked, infected pork or other meats. Medications can eliminate the parasite and treat symptoms.
Tularemia is a rare, highly infectious disease spread by insects and wild animals. Landscapers, hunters and laboratory workers are especially at risk.
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 — 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 infection usually resolves on its own, but occasionally it can be serious.
Whiplash is a neck injury often linked to auto accidents. Discover which treatments work and which don't.
A vaccine can protect you against yellow fever — a sometimes deadly mosquito-borne disease found in sub-Saharan Africa and South America.
Jun. 04, 2013
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