What Does SGB Feel Like During the Procedure?

If you've made it this far in your research, you probably already know what Stellate Ganglion Block (SGB) is and what it can potentially do for PTSD, anxiety, and a nervous system that feels stuck in survival mode. But for most people, the bigger question comes after that. What does it actually feel like?

At this point, a lot of people have already read the science and looked into the outcomes. What still feels unfamiliar is the experience itself. The room. The procedure table. The needle. Being awake while it's happening. The few quiet minutes where you're waiting to see what your body is going to feel like. That's usually the part people feel most anxious about.

And honestly, that makes sense. SGB is still new to a lot of people. Most of us did not grow up hearing about nervous system procedures for trauma or chronic stress, so it can feel hard to picture what the experience is actually like in real life. From what clinicians who perform SGB regularly report, the fear usually comes more from not knowing what to expect than from the procedure itself. Once people understand what the process actually looks and feels like, a lot of that anxiety softens.

Before the procedure

You'll usually be asked to avoid food and certain medications for a few hours beforehand. Your provider will give you the exact instructions based on your medical history and the clinic's process.

When you arrive, you'll likely change into a gown, review your medical history again, and meet with the doctor performing the procedure. This is also the time to ask any last questions you have. A good provider will walk you through everything clearly and make sure you feel comfortable before starting.

You will not be put under general anesthesia. SGB is usually done while you're awake. Some clinics may offer a mild oral sedative beforehand if needed, but that's something to discuss directly with your provider ahead of time.

Getting set up

You'll lie flat on your back on the procedure table, with your head turned slightly away from the side being injected. The stellate ganglion is a small cluster of nerves near the base of your neck, sitting in front of the spine in the lower cervical area. To reach it, your provider needs clear access to the front of your neck on one side.

The skin is cleaned with antiseptic. An ultrasound probe is placed on your neck so the provider can see exactly where the ganglion is, where the nearby blood vessels are, and where the needle is going. This is a meaningful safety detail. Modern SGB is image-guided, which is part of why complications are so rare.

The injection itself

Most people describe the actual injection as a small sting that lasts a few seconds, followed by a feeling of pressure as the medication goes in. The medicine itself is a local anesthetic. The volume is small.

The whole thing tends to take about 10 to 15 minutes from the moment you lie down to the moment the needle is out. Some of that is positioning, some of it is imaging, and only a small portion of it is the injection itself.

You stay awake through all of it. You can talk. You can ask the provider what they're doing. You can take a breath when you need one. If you have specific questions about what you can and can't do during the procedure, ask your provider ahead of time or before you begin.

What you'll feel within minutes

This is the part people aren't always told to expect, so it's worth walking through.

After a successful block, the side of your neck and face that was injected will start to feel slightly different. You might notice:

• A droopy eyelid on that side
• A smaller pupil on that side
• Mild facial flushing or warmth
• A slightly stuffy nostril
• A sensation of a lump or thickness in the throat
• Mild hoarseness when you talk
• Warmth or tingling running down the arm on that side

Together, the eyelid, pupil, and flushing are called Horner's syndrome. It sounds intense, but it's actually a good sign. It tells your provider the block reached the right place. These effects fade over the next several hours as the local anesthetic wears off.

You may also feel emotionally different in a way that's harder to describe. Some people say the world goes quieter. Some say their shoulders drop for the first time in years. Some don't notice anything at first and feel the shift the next day, or the day after that. There's no single right experience, and it's not a marker of whether the procedure will work for you.

What happens after the procedure

You'll rest in a recovery area while the care team monitors you. They'll check that the block is working as expected, that your vital signs are steady, and that you're comfortable. Most clinics will offer water and a quiet space to sit.

You can't drive yourself home. You'll need a ride. For the rest of the day, the recommendation is to take it easy. No heavy lifting, no alcohol, and no big meals right away, because swallowing on that side will feel a little off until the local anesthetic fully wears off.

By the next morning, the visible effects of the block (the eyelid, the pupil, the warmth) are gone. What can stay is the therapeutic effect. For people with PTSD or trauma-driven anxiety, the relief often shows up within hours to a few days, and for many people it can last weeks to months.

Finally

SGB is not painless, but it is well-tolerated. Most people describe the experience as far less intense than they were bracing for. The needle is small, the procedure is quick, and the team around you is trained to make it feel as calm as possible.

If you're considering SGB and the experience itself is what's holding you back, that's a reasonable thing to want to understand fully before saying yes. A good clinic will walk you through every step of it before you ever lie down on that table.

If you're still weighing whether SGB or Ketamine-Assisted Therapy is the right place to start, we've written a separate piece comparing the two. See "SGB vs. Ketamine Therapy for PTSD: How to Choose."

Want to talk it through?

If you'd like help figuring out whether SGB is the right next step for you, Enthea works with employers to make innovative mental health treatments like SGB part of their benefits coverage. Reach out to us at enthea.com to learn whether your employer offers Enthea-covered SGB, or how to advocate for it if they don't yet.