In-depth

Acoustic neuroma

Acoustic neuroma is a benign tumor that grows on the balance and hearing nerve in the head. Pressure on the nerve may cause hearing loss.

Agoraphobia

Do you feel trapped in your own home? Do you worry about having a panic attack? Find out how agoraphobia can be treated.

Anaphylaxis

Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.

Anemia

Anemia occurs in many forms, but all involve a shortage of healthy red blood cells. Treatment depends on what's causing your anemia.

Angina

Angina is a common type of chest pain caused by coronary artery disease. Unstable angina can be a warning sign of a heart attack.

Anhidrosis

Anhidrosis means no sweat — literally. The main symptom of this potentially life-threatening condition is the inability to sweat normally.

Anorexia nervosa

Find out what's behind this life-threatening eating disorder and how to treat it.

Aplastic anemia

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

Autonomic neuropathy

Autonomic neuropathy refers to damage to or disease affecting the involuntary nerves.Autonomic neuropathy refers to damage to or disease affecting the involuntary nerves.

Bee stings

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

Benign paroxysmal positional vertigo (BPPV)

Benign paroxysmal positional vertigo involves brief episodes of dizziness when your head is placed in particular positions. The condition is easily treated.

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.

Cardiomyopathy

Cardiomyopathy is a heart muscle disease. Treatment options depend on what type of cardiomyopathy you have.

Chest pain

Chest pain can be frightening, but it doesn't always indicate a heart attack.

Chiari malformation

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

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.

Cyclic vomiting syndrome

Cyclic vomiting syndrome can last for hours or days and shares many triggers with migraines.

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.

Diabetic neuropathy

Diabetes can damage nerves throughout your body — a condition known as diabetic neuropathy. Nerve damage can cause pain, disability and other serious complications.

Dilated cardiomyopathy

Dilated cardiomyopathy is a disease of the heart in which the heart's main pumping chamber becomes enlarged and doesn't pump blood efficiently.

Drug addiction

Drug addiction is the compulsive dependence on a legal or illegal drug. Treatment and a strong support system may help break an addiction.

Drug allergy

Drug allergy can occur with many medications. Find out what you can do to recognize and avoid potentially dangerous reactions.

Dumping syndrome

Egg allergy

Egg allergy can cause a serious reaction in children and adults. Here's how to recognize egg allergy symptoms, and what to do if a severe reaction occurs.

Eisenmenger syndrome

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

Enlarged heart

Enlarged heart is often a sign of a serious heart condition. Find out causes and treatments for enlarged heart.

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.

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.

Food poisoning

Food poisoning has many forms, and some can be serious. Here's how to recognize food poisoning and ways to prevent getting sick.

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.

Heart attack

Heart disease

Heart disease, usually thought of as blockages in the arteries that can cause a heart attack, can describe any medical condition affecting your heart.

Heart murmurs

This whooshing sound in your heart is usually harmless, but in some cases heart murmurs can alert your doctor to specific heart conditions.

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.

Hypertrophic cardiomyopathy

Hypertrophic cardiomyopathy is a genetic disorder in which heart muscle becomes abnormally thick. It's the most common cause of sudden cardiac death in young people.

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

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.

Left ventricular hypertrophy

Left ventricular hypertrophy, thickening of the wall of your heart's main pumping chamber, increases your risk of cardiovascular diseases.

Menstrual cramps

A monthly period is bad enough. Add in painful menstrual cramps, and you may be cursing this thing called womanhood. How do you get relief?

Mitral valve prolapse

Mitral valve prolapse occurs when the valve separating two of your heart's chambers malfunctions. The disorder usually isn't serious and often doesn't require surgical treatment.

Panic attacks

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

Peanut allergy

Peanut allergy can be serious. Find out what you need to know to prevent a life-threatening reaction.

Penicillin allergy

Penicillin allergy is the most common drug allergy. Find out what you can do to avoid potentially dangerous reactions.

Pericardial effusion

Pericardial effusion, the accumulation of excess fluid in the sac-like structure around the heart, can decrease heart function and can be life-threatening.

Polycythemia vera

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

Post-concussion syndrome

Post-concussion syndrome is a complex disorder in which concussion symptoms — such as headaches and dizziness — can last for more than a year.

Progressive supranuclear palsy

Progressive supranuclear palsy — a syndrome with many similarities to Parkinson's disease — has no effective treatment, but certain medications and self-care measures can help.

Pseudotumor cerebri

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

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.

Shellfish allergy

Spider bites

Spider bites — Comprehensive overview covers symptoms, complications, treatment of spider bites.

Spinal headaches

Spinal headaches may occur after a spinal tap or spinal anesthesia. The pain can be severe, but treatment is available.

Spontaneous coronary artery dissection

Find out about this rare cause of heart attack in young, healthy people.

Sudden cardiac arrest

Sudden cardiac arrest is a medical emergency. Rapid treatment improves your chances of survival.

Takayasu's arteritis

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

Thrombocytosis

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

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.

Viral hemorrhagic fevers

Ebola and Marburg viruses and yellow fever belong to a group of potentially deadly illnesses called viral hemorrhagic fevers. Find out about risk.

Vitamin deficiency anemia

Lacking certain vitamins can lead to vitamin deficiency anemia. Find out which vitamins are linked to this condition.

Whiplash

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

Yellow fever

A vaccine can protect you against yellow fever — a sometimes deadly mosquito-borne disease found in sub-Saharan Africa and South America.

Sep. 11, 2012