Health Library

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  • Ultraviolet Rays From the Sun

    The sunlight that reaches the earth has ultraviolet A and ultraviolet B (UVA and UVB) rays. These ultraviolet rays are the main causes of damage to the skin from the sun. UVA and UVB rays affect the skin's sensitivity to sun exposure in different ways. UVA Can pass through window...

  • Fever Temperatures: Accuracy and Comparison

    You can take a temperature using the mouth (oral), anus (rectal), armpit (axillary), ear (tympanic), or forehead (temporal). But the temperature readings vary depending on which one you use. And you need an accurate measurement to know if a fever is present. Medical research hasn't found an exact correlation between...

  • How Pregnancy (Conception) Occurs

    Most women are able to become pregnant from puberty, when their menstrual cycles begin, until menopause, when their cycles stop. A pregnancy starts with fertilization, when a woman's egg joins with a man's sperm. Fertilization usually takes place in a fallopian tube that links an ovary to the uterus. If...

  • Birth Control: How to Use the Patch

    Talk to your doctor about what day to start using the patch. Doctors usually recommend that the first patch be placed on the first day of your next menstrual period. If the patch is started on any other day, use a backup method of birth control for 7 days. Start...

  • Birth Control: How to Use the Ring

    The ring is used to prevent pregnancy. It's a soft plastic ring that you put into your vagina. It's also called the vaginal ring. It gives you a regular dose of the hormones estrogen and progestin. The ring protects against pregnancy for 1 month at a time. You wear one...

  • Hormonal Birth Control: Risk of Blood Clots

    The estrogen in combination hormonal birth control methods sometimes raises the risk of blood clots. These blood clots could be in a leg (deep vein thrombosis) or in a lung (pulmonary embolism). But the risk for blood clots is overall very low with...

  • Lung Surgery for Lung Cancer

    Looks at lung surgery (called thoracotomy) to treat lung cancer. Covers how it is done and what to expect after surgery. Covers its risks and how well it works. Offers illustrations of three types of surgery: wedge resection, lobectomy, and pneumonectomy.

  • Surgery: What to Expect

    Surgery can be stressful. This information will help you understand what you can expect. And it will help you safely prepare for surgery. You will have an appointment with your surgeon before your surgery. Take along a list of questions about the...

  • Magnetic Resonance Imaging (MRI) of the Breast

  • Hysteroscopy

    A hysteroscopy is a procedure to find and treat problems with your uterus. It may be done to remove growths from the uterus, such as fibroids or polyps. It may also be used to diagnose and treat abnormal bleeding or fertility problems. The doctor will guide a lighted tube through...


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