Influenza — commonly called the flu — is a contagious respiratory illness caused by the influenza virus. It primarily affects the nose, throat, and lungs, and symptoms can range from…
What is Insomnia?
Insomnia is a common sleep disorder in which a person has difficulty falling asleep, staying asleep, or waking too early and being unable to return to sleep.…
What Is Pneumonia?
Pneumonia is an infection that affects one or both lungs. It causes the air sacs (alveoli) to become inflamed and fill with fluid or pus. This makes…
Eye fatigue, also known as eye strain or asthenopia, describes the tired, heavy, or burning feeling that develops when your eyes have been working hard for a long period. It’s…
What Is a Fever?
A fever is a body temperature that is higher than normal. Your body’s temperature is regulated by an area in the brain called the hypothalamus,…