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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

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There can actually be a 25-hour time difference between certain locations in the world. The International Date Line passes between the islands of Samoa and American Samoa. It is not a straight line, but "zig-zags" around various island chains. Therefore, Samoa and nearby islands have one date, while American Samoa and nearby islands are one day behind. Daylight saving time is used in some islands, but not in others—further shifting the hours out of sync with natural time.

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The first oral chemotherapy drug for colon cancer was approved by FDA in 2001.

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All patients with hyperparathyroidism will develop osteoporosis. The parathyroid glands maintain blood calcium within the normal range. All patients with this disease will continue to lose calcium from their bones every day, and there is no way to prevent the development of osteoporosis as a result.

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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

Common metastatic sites for ovarian cancer. Common metastatic sites for ovarian cancer.
Comparison of breast cancer and fibrocystic disease. (A) Breast with a malignant tumor growing in th Comparison of breast cancer and fibrocystic disease. (A) Breast with a malignant tumor growing in th
Gastric cancer. In advanced stages of gastric cancer, malignant cells spread to form tumors in the l Gastric cancer. In advanced stages of gastric cancer, malignant cells spread to form tumors in the l
Early Cancer Detection: 7 Warning Signs Early Cancer Detection: 7 Warning Signs
Origins of (a) a terminal and (b) an intercalary deletion Origins of (a) a terminal and (b) an intercalary deletion
Video: Methods that regulate pH

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