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    Hernias or aneurysms are bulging sections in a muscle or blood vessel. A nodule is usually a growth on a gland. A hernia, aneurysm, or nodule may be felt under the skin but may not be visible. These types of lumps may need more medical evaluation.

    • An inguinal hernia is a soft lump in the groin or near the navel. It may be more visible when you cough. Hernias that disappear when you press on them may not need any treatment. Hernias that don't disappear when you press on them may be more serious and need medical treatment.
    • A bulging section in the wall of a blood vessel (aneurysm) may feel like a pulsating lump in the abdomen, in the groin, or behind the knee. It can cause serious problems if it involves the blood vessels in the brain or the abdomen. Aneurysms may be a medical emergency and may require immediate evaluation.
    • A thyroid nodule is an abnormal growth on the thyroid gland. An enlarged thyroid gland (goiter) is in the neck just below the Adam's apple.

    A lump caused by cancer is usually hard, irregularly shaped, and firmly fixed under the skin or deep in tissue. Although they usually do not cause pain, some types of cancerous lumps are painful. Most lumps are not caused by cancer.

    Swelling may also be caused by:

    Check your symptoms to decide if and when you should see a doctor.

    This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

    WebMD Medical Reference from Healthwise

    Last Updated: July 24, 2013
    This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
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