In-depth

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

Amenorrhea

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

Anemia

Antiphospholipid syndrome

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.

Aplastic anemia

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

Arteriovenous malformation

Aspergillosis

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

Brain aneurysm

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.

Bruxism (teeth grinding)

Carbon monoxide poisoning

Carotid artery disease

Chagas disease

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

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.

Convergence insufficiency

 

Cough headaches

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.

Dengue fever

Depression

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

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

Exercise headaches

External compression headaches

Eyestrain

Reduce eyestrain by following these simple tips.

Farsightedness

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.

Genital herpes

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.

Grand mal seizure

Hangovers

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

Heatstroke

Hemophilia

Histoplasmosis

HIV/AIDS

Hydrocele

Hyperglycemia in diabetes

Hyperparathyroidism

Hyponatremia

Hypoparathyroidism

Impacted wisdom teeth

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.

Intracranial hematoma

Iron deficiency anemia

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

Jellyfish stings

Lead poisoning

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.

Lupus

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.

Meningioma

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.

Mental illness

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

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

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 and panic disorder

Parvovirus infection

Pheochromocytoma

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

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.

Polycystic kidney disease

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

Preeclampsia

Premenstrual syndrome (PMS)

Presbyopia

Prolactinoma

Pseudotumor cerebri

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

Pulmonary edema

Q fever

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.

Recurrent breast cancer

Respiratory syncytial virus (RSV)

Rocky Mountain spotted fever

Rubella

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

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

Staph infections

Strep throat

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

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

Thunderclap headaches

TMJ disorders

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

Tonsillitis

Toxic shock syndrome

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

Tularemia

Typhoid fever

Valley fever

West Nile virus

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

Whiplash

Yellow fever

June 04, 2013