In-depth

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.

Allergies

Aortic aneurysm

Asbestosis

Asbestosis is a lung disease resulting from prolonged exposure to asbestos, a product once commonly used in the building and manufacturing industries.

Ascariasis

Asthma attack

Asthma attack: Find out what the symptoms are and how to treat an asthma attack.

Atelectasis

Atelectasis, or collapsed lung, is a possible complication of many respiratory conditions. Find out what causes it and how it's treated.

Barrett's esophagus

Bile reflux

Bird flu (avian influenza)

Bronchitis

Bronchitis often develops after a cold. Learn how to prevent this potentially serious lung infection.

Cancer

Learn about cancer, what it looks like and what causes it.

Castleman disease

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.

Churg-Strauss syndrome

Churg-Strauss syndrome is a rare disorder marked by blood vessel inflammation that affects organs throughout the body. Asthma is the most common sign.

Common cold

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

Common cold in babies

Do you feel as if you're constantly wiping your baby's nose? Learn to recognize, treat and prevent the common cold.

COPD

Croup

The barking cough of croup can be scary. But it's usually not serious and gets better with rest and fluids.

Dilated cardiomyopathy

Dust mite allergy

Dust mite allergy, an immune system reaction to inhaled dust mite "debris," causes hay fever symptoms and may cause allergy-induced asthma.

Dysphagia

Ebola virus and Marburg virus

Egg allergy

Ehrlichiosis

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

Enlarged heart

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

Esophageal cancer

Reduce your risk of esophageal cancer by eating more fruits and vegetables.

Esophagitis

GERD

Goiter

Goiter is an enlargement of the thyroid gland due to a variety of causes. The condition can cause difficulty swallowing or breathing.

Group B strep disease

A common bacterium, group B strep may cause serious illness, especially in newborns, older adults and people who have certain chronic health conditions.

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.

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 failure

Heart murmurs

Histoplasmosis

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.

Hodgkin's lymphoma

Influenza (flu)

Laryngitis

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.

Lung cancer

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

Measles

Mesothelioma

Mesothelioma is a type of cancer closely linked to asbestos exposure. Find out the signs and symptoms of malignant mesothelioma and how to protect yourself.

Milk allergy

Mitral valve stenosis

Non-Hodgkin's lymphoma

Pectus excavatum

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.

Pericarditis

Pleurisy

Pleurisy is the painful inflammation of the membranes that surround your lungs. The cause can be one of a number of underlying conditions.

Pneumonia

Pneumonitis

Pneumonitis is a general term for lung inflammation. It can cause difficulty breathing, often accompanied by a cough.

Pulmonary edema

Pulmonary embolism

Pulmonary fibrosis

Pulmonary fibrosis results from scar tissue that forms in your lungs. This affects your ability to breathe and obtain enough oxygen.

Q fever

Recurrent breast cancer

Respiratory syncytial virus (RSV)

Roseola

Roseola is a common infection of childhood. The condition causes a fever that lasts several days, followed by a rash on the trunk and neck.

Sarcoidosis

Sarcoidosis starts in your lungs but can cause inflammation in any part of your body. It can last a lifetime, or disappear in a few years.

Severe acute respiratory syndrome (SARS)

Severe acute respiratory syndrome (SARS) has sickened people worldwide. Although effective treatments aren't yet available, common-sense precautions may help you avoid infection.

Sinus headaches

Sjogren's syndrome

Spinal cord injury

Stevens-Johnson syndrome

Stevens-Johnson syndrome is a disorder of the skin and mucous membranes. Often, this severe adverse reaction is caused by medication or an infection.

Swine flu (H1N1 flu)

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

Throat cancer

The most common throat cancers are linked to smoking and excessive alcohol use.

Tuberculosis

Tuberous sclerosis


Tularemia

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

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.

Wegener's granulomatosis

Wegener's granulomatosis is an uncommon disease that causes blood vessel inflammation that can damage lungs, kidneys and other organs. Untreated, it can be fatal.

Whipple's disease

Whipple's disease is a rare bacterial infection that affects primarily the gastrointestinal system, and can be treated successfully with antibiotics.

Whooping cough

May 24, 2013