In-depth

Alcohol intolerance

Allergies

Aspergillosis

Broken nose

Chronic daily headaches

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.

Cluster headache

Cluster headaches usually occur repeatedly on one side of your head and cause intense pain that feels like a stabbing sensation in your eye.

Cystic fibrosis

Drug addiction

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.

Food allergy

Food allergy symptoms can make you miserable. Unfortunately, there's no cure — but there are steps you can take to keep your symptoms in check.

Humidifiers

Influenza (flu)

Nasopharyngeal carcinoma

Rebound headaches

Respiratory syncytial virus (RSV)

Rubella

Shellfish allergy

Sinus headaches

Wheat allergy

Whooping cough

Feb. 26, 2016