A trigger point injection is used to treat various painful conditions, such as myofascial pain syndrome. These injections are used to inactivate pain signals in the body through the release of endorphins and inactivation of the trigger point injected.

Your muscles contract and relax whenever you move. If a muscle does not relax completely, a very tight band of muscle fibers can spasm and form a trigger point.

Traumatic injury, overexertion, muscle tension, muscle spasms, pinched nerves, and hormonal deficiencies are common causes of trigger points.

A trigger point can cause extreme pain. It may feel tender, hard, or twitch when you touch it. In some cases, a trigger point can irritate surrounding nerves causing pain to spread to nearby areas (referred pain). Your pain may limit your ability to move comfortably.

Trigger point injections are performed in an outpatient setting. The trigger point is located by palpation by the physician and the site is marked.

Ultrasound may also be used to identify the location of the trigger point. The skin of the site to be injected is cleaned with an antiseptic solution to help reduce the risk of infection.

A local anesthetic may be applied to numb the area prior to the injection to make the procedure more comfortable for the patient.

The needle is then inserted into the trigger point and the medication is injected. A bandage may be applied to the injection site after the procedure, if necessary.

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