A phobia is an uncontrollable, irrational, and persistent fear of a specific object, situation, or activity. The fear experienced by people with phobias can be so great that some go to extreme lengths to avoid the source of their fear.

Many sports injuries can be prevented with proper conditioning and training, wearing appropriate protective gear, and using proper equipment.

Amenorrhea means you haven't had your period for more than 3 cycles. It can be caused by a variety of things including overexercising, being overweight, or due to an ovulation problem.

Rocky Mountain spotted fever (RMSF) is an infection caused by the bite of an infected tick.

Detailed information on prevention of infectious diseases

Read on to learn about common refractive errors, including astigmatism, nearsightedness, and farsightedness.

Detailed information on measles, including symptoms, complications, prevention, and treatment.

Eye injuries affect about 2.5 million people every year. Here are tips for preventing injury to your eyes.

Malaria is caused by a parasite. It's passed to humans by the bite of an infected Anopheles mosquito.

Detailed information on eye safety and tips to avoid eye injury