Trigger Point Injection

A trigger point is a painful area in a muscle. It may feel like there is “knot” in the muscle or an area of tightness. When pressure is applied to the trigger point, the pain spreads out to other areas of the body. A trigger point injection is a shot that is given in this painful spot. Thigh MusclesIf you have a trigger point in the thigh muscle, the doctor can give an injection to relieve pain.Copyright © Nucleus Medical Media, Inc.

  • Call Your Doctor

    After you arrive home, contact your doctor if any of the following occurs:

    • Signs of infection, including fever and chills
    • Redness, swelling, increasing pain, bleeding, or discharge from the injection site
    • Numbness, tingling, pain, or weakness
    • Any new or unexplained symptoms

  • Definition

    A trigger point is a painful area in a muscle. It may feel like there is “knot” in the muscle or an area of tightness. When pressure is applied to the trigger point, the pain spreads out to other areas of the body.


    A trigger point injection is a shot that is given in this painful spot.

    Thigh Muscles
    Posterior Thigh Muscles
    If you have a trigger point in the thigh muscle, the doctor can give an injection to relieve pain.
    Copyright © Nucleus Medical Media, Inc.

  • What to Expect

  • Reasons for the Procedure

    Trigger point injections are given to reduce pain and increase physical functioning so that you can participate in a physical therapy program.

  • Possible Complications

    Complications are rare. But, no procedure is completely free of risk. If you are planning to have this injection, your doctor will review a list of possible complications, which may include:

    • Tenderness, bruising, or bleeding at the injection site
    • Infection
    • Dizziness
    • Allergic reaction to the local anesthetic or medicine
    • Damage to organs, such as the lung (rare)
    • The need for other treatments if this injection is not effective

    Factors that may increase the risk of complications include:

    • Smoking

    You should not have this injection if you:

    • Have allergies to the local anesthetic or medicines being used
    • Have a current infection
    • Have a bleeding disorder
    • Are pregnant