Pneumonia is an infection of the lungs caused by fungi, bacteria, or viruses. General symptoms include chest pain, fever, cough, and trouble breathing.

The bacterium Streptococcus mutans was first implicated in causing dental caries in 1924, when an English dentist named J. Kilian Clarke found this microorganism at the scene of a cavity and ...

Normal urine color ranges from pale yellow to deep gold. Urine that’s abnormally colored may have tints of red, orange, blue, green, or brown. Abnormal urine color can be caused by a variety of ...

Has your urine color changed from its usual hue? Find out what causes bright-yellow urine, from dietary changes to underlying conditions, and how doctors treat each cause.