Nutritional supplements
Learning Center
Video: Colonoscopy
See what a doctor sees when you undergo an examination of your colon.
Video: Barium enema
See what to expect during an X-ray examination of your colon.
Video: Allergy tests
What happens in an allergy test? Watch this video and find out.
Urine cytology
A urine cytology test uses a sample of your urine to look for abnormal cells, which could indicate a urinary tract cancer.
Tumor vs. cyst: What's the difference?
A Mayo Clinic expert explains the differences and similarities between these two types of growths and how doctors determine if they're cancerous.
Too much vitamin C: Is it harmful?
Vitamin C is an essential nutrient, but too much carries its own risks.
Toe walking in children
Walking on toes or the balls of the feet is fairly common in children who are learning to walk. Most children outgrow it.
Thyroid peroxidase antibody test: What is it?
A thyroid peroxidase antibody test can help determine the cause of thyroid disease.
Thalassemia
Some forms of this inherited blood disorder usually show up before the age of 2, often causing anemia. More severe forms of the disease require regular blood transfusions.
Testicular exam
Examining your testicles regularly can help you notice changes when they occur and identify testicular problems.
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