Aerobic exercise
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Trichomoniasis
This common sexually transmitted infection is caused by a parasite. Reduce your risk by using condoms when you have sex.
Umbilical hernia
Learn about this condition in which your intestines create a bulge near your navel.
Whooping cough
Learn more about the symptoms, causes, treatment of this highly contagious, vaccine-preventable lung infection.
Walking for fitness: Staying motivated
Starting a walking program is easy. Sticking with it is trickier. To stay motivated, try these tips: 1. Set goals, such as walking every day or walking for a set amount of time. 2. Make walking enjoyable. Find someone to walk with you or simply soak in the scenery. 3. Vary your routine. If you walk the same route every day, boredom may set in. Instead, mix it up with several different routes. Just remember to be safe: Tell a family member which route you're taking.
Walking for fitness: Overcoming setbacks
Don't give up if your walking program goes off track. Get back in the game with these four tips: 1. Stop beating yourself up. Shrug it off as a temporary setback, even if it happens more than once. 2. Re-evaluate your goals. Make sure your goals are neither too hard nor too easy. 3. Get going. Just do some form of exercise today, even if it's only for 5 minutes. 4. Keep planning. Figure out ways to fit in a walk even if you're going on a trip, working overtime or juggling family duties.
Video: Allergy tests
What happens in an allergy test? Watch this video and find out.
Video: Colonoscopy
See what a doctor sees when you undergo an examination of your colon.
Video: Sentinel node biopsy for melanoma
Video shows sentinel node biopsy to determine whether melanoma has spread.
Video: Skin cancer — How skin cancer develops
Watch this video to see what melanoma and nonmelanoma skin cancers look like and how they develop.
Video: Endoscopy
An endoscopy allows your doctor to view your esophagus, stomach and part of the small intestine. Here's how it works.
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