Does a Gel Injection Hurt? What to Expect Before, During, and After

---

Does a Gel Injection Hurt? The Short Answer

“Does a gel injection hurt?” is one of the most common questions patients ask before their first hyaluronic acid injection. The honest answer: most patients describe it as mildly uncomfortable but not truly painful.

In clinical studies, patients rate the injection at roughly 1.7 to 3 out of 10 on a pain scale — well within the “mild” range. Many compare the initial needle prick to a blood draw. Once the needle is in, you feel pressure rather than sharp pain as the gel fills the joint space.

That said, everyone’s experience is different. Factors like your anxiety level, the skill of the provider, the numbing technique used, and even how inflamed your knee is that day all play a role. This guide walks you through exactly what happens before, during, and after the procedure so you can go into your appointment prepared.

---

What Happens During the Injection: Step by Step

Understanding the procedure removes fear of the unknown, which research shows is one of the biggest drivers of injection anxiety. Here is what to expect from start to finish.

Step 1: Positioning (1-2 minutes)

Your doctor will ask you to either lie on your back with the knee straight or sit with the knee slightly bent. The goal is to relax the muscles around the knee and open the joint space for easy access.

Step 2: Cleaning the Skin (1 minute)

The injection area is swabbed with an antiseptic solution like iodine or chlorhexidine using a circular motion from the center outward. This step prevents infection and feels cool on the skin.

Step 3: Numbing the Area (1-2 minutes)

Most providers numb the injection site using one or more of these methods:

Step 4: The Injection Itself (<30 seconds)

Using a thin needle (typically 22-25 gauge), the doctor inserts the needle into the joint space, usually from the outer or inner side of the knee. If excess fluid is present, it may be drained first. Then the hyaluronic acid gel is slowly injected.

What you feel: A brief pinch as the needle enters the skin (similar to a blood draw), followed by a sensation of pressure or fullness as the gel fills the joint. Some patients feel mild warmth. The entire injection takes less than 30 seconds.

Step 5: Post-Injection Movement (30-60 seconds)

Your doctor may ask you to gently bend and straighten your knee a few times. This helps spread the gel throughout the joint. You might feel slight achiness during this step as the material distributes.

Step 6: Bandage and Rest (5 minutes)

A small bandage is applied. You rest briefly in the office so your provider can check for any immediate reactions. Most people feel well enough to walk out of the office and drive themselves home.

---

Pain Comparison: Gel Injections vs. Cortisone vs. PRP

Not all knee injections feel the same. Here is how gel injections stack up against cortisone and PRP based on clinical data.

---

Before Your Injection: How to Prepare

Preparation goes a long way toward reducing both anxiety and physical discomfort. These evidence-based strategies help.

Manage Your Anxiety

Research published in the Journal of Orthopaedic Research found that a brief 5-minute guided meditation before an injection significantly reduces anxiety scores in patients. Try these approaches:

Practical Preparation

• Wear loose-fitting pants or shorts so your knee is easily accessible
• Ask about numbing options when you schedule your appointment
• Avoid blood thinners if your doctor advises (aspirin, ibuprofen, fish oil) to reduce bruising risk
• Eat a light meal beforehand — an empty stomach can increase lightheadedness
• Bring an ice pack in a cooler to use on the drive home

For a complete preparation checklist, see our guide on how to prepare for your knee injection.

---

During the Injection: What You’ll Actually Feel

The injection itself takes less than two minutes from needle insertion to bandage. Here is what patients commonly report at each phase.

The Needle Prick (2-5 seconds)

If numbing is used (and it usually is), you may feel nothing more than light pressure. Without numbing, patients describe a quick pinch similar to a flu shot or blood draw. This is the briefest part of the process.

The Gel Entering the Joint (10-20 seconds)

This is the part most patients notice. As the thick hyaluronic acid gel flows into your joint space, you feel pressure and fullness rather than sharp pain. Some patients describe it as:

• “A weird fullness in my knee”
• “Like my knee was being inflated slightly”
• “Mild aching that lasted a few seconds”
• “Honestly, I barely felt it”

The pressure sensation is directly related to the volume being injected. Single-injection formulas (like Synvisc-One) deliver more volume at once, so you may feel slightly more pressure than with smaller-volume series injections.

The Needle Removal (instant)

You barely notice the needle coming out. Your doctor applies pressure with gauze and places a small bandage over the site.

---

After the Injection: Recovery Timeline

Knowing what to expect in the hours and days after your injection helps you tell the difference between a normal response and something that needs attention.

First 2-4 Hours

The numbing agent keeps your knee comfortable. As it wears off, you may notice mild soreness emerging at the injection site. This is normal.

What to do:

• Apply an ice pack wrapped in a towel for 20 minutes on, 20 minutes off
• Take acetaminophen (Tylenol) if needed — avoid ibuprofen for the first 5-7 days, as it may interfere with the gel’s healing mechanism
• Light walking is fine; avoid stairs and squatting if possible

24-48 Hours

This is when most people notice the peak of any post-injection soreness. Studies show the majority of patients experience only mild discomfort that does not require medication.

What’s normal:

• Mild soreness or achiness around the injection site
• Slight swelling or puffiness in the knee
• Minor bruising (a small discolored area)
• Mild stiffness when first standing up

What to do:

• Continue icing as needed
• Rest the joint — avoid running, jumping, or heavy lifting
• Keep the bandage clean and dry
• Gentle walking and range-of-motion exercises are fine

Days 3-7

Most injection-site soreness resolves by day 2 or 3. Some patients feel back to their baseline within 24 hours; for others, mild stiffness lingers up to a week. Both are normal.

What to do:

• Gradually return to low-impact activities (walking, swimming, cycling)
• Consider starting gentle stretching or physical therapy exercises
• Hold off on high-impact activities until your doctor clears you

Weeks 2-6: When Relief Begins

Do not be discouraged if your knee does not feel better right away. Unlike cortisone (which can work within days), gel injections take time. Most patients begin noticing improvement around 10-15 days after the injection, with the full benefit appearing at 4-6 weeks.

During this period, clinical studies show the most significant improvement in pain scores, stiffness, and physical function. The gel gradually restores lubrication and reduces inflammation within the joint.

Months 2-6: Sustained Relief

Once the gel takes full effect, benefits typically last up to 6 months. You can return to all normal activities including golf, gardening, walking, and travel. Many patients find this their best period for engaging in exercise programs that further strengthen the joint.

For a detailed week-by-week breakdown, see our HA injection timeline guide.

---

---

When to Call Your Doctor

Most side effects after a gel injection are mild and self-limiting. However, certain symptoms require prompt medical attention.

---

Frequently Asked Questions

How bad does a gel injection in the knee hurt?

Most patients rate the pain at 2-3 out of 10 on a standard pain scale. With local numbing (lidocaine or cold spray), many patients say they barely feel the needle. The most noticeable sensation is pressure as the gel enters the joint, not sharp pain. The entire injection takes less than 30 seconds.

Is a gel injection more painful than a cortisone shot?

The injection itself feels similar for both. However, gel injections cause fewer post-injection flares than cortisone. About 1% of gel injection patients experience a flare, compared to up to 30% of cortisone patients. If you have tolerated a cortisone shot, a gel injection should feel the same or easier.

How long does pain last after a gel injection?

Injection-site soreness typically peaks at 2-6 hours after the procedure and resolves within 24-48 hours. Some patients feel mild stiffness for up to a week, but this is uncommon. Applying ice and taking acetaminophen as needed helps manage any discomfort. Avoid ibuprofen for the first 5-7 days to allow the gel to work optimally.

Can I walk after a gel injection?

Yes. Light walking is encouraged immediately after the injection. Most patients walk out of the office on their own and can drive themselves home. Avoid strenuous activities, prolonged standing, and heavy lifting for 24-48 hours. You can gradually return to normal activities over the following week.

What can I do to make the injection less painful?

Ask your doctor to use lidocaine numbing before the injection — buffered lidocaine can reduce injection pain by up to 50%. Applying ice to the knee for 5-10 minutes before the procedure also helps. Practice slow breathing during the injection, bring music or a podcast to distract yourself, and let your provider know if you are anxious. Being well-hydrated and having eaten a light meal beforehand can also prevent lightheadedness.

How long does it take for a gel injection to start working?

Unlike cortisone, which can relieve pain within days, gel injections work gradually. Most patients notice improvement starting around 10-15 days after the injection, with full benefit developing over 4-6 weeks. The effects typically last up to 6 months. If you do not notice improvement by 6 weeks, discuss next steps with your doctor.

Are gel injections safe for people with egg or poultry allergies?

Some hyaluronic acid products are derived from rooster combs, which can trigger reactions in patients with bird or poultry allergies. However, non-animal-derived (bacterial fermentation) formulations are widely available and safe for these patients. Tell your doctor about any allergies before your procedure so they can choose the appropriate product.

---

Related Resources

• Hyaluronic Acid Injection Side Effects: What to Expect — Detailed guide to common and rare side effects
• How to Prepare for Your Knee Injection — Complete checklist for before your appointment
• HA Knee Injections: What to Expect (Timeline) — Week-by-week recovery and relief timeline
• Hyaluronic Acid Injections — Full treatment overview with evidence ratings
• Cortisone Injections — How cortisone compares for knee pain relief
• PRP Injections — Platelet-rich plasma therapy explained

---

References

1. Hospital for Special Surgery. “Knee Gel Injections (Viscosupplementation).” HSS Health Library. Accessed March 2026. https://www.hss.edu/health-library/conditions-and-treatments/knee-gel-injections-viscosupplementation

2. Mayo Clinic. “Hyaluronic acid (injection route).” Mayo Clinic Drug Information. Accessed March 2026. https://www.mayoclinic.org/drugs-supplements/hyaluronic-acid-injection-route/description/drg-20074557

3. Moisio K, et al. “Pain during intra-articular injection in overweight patients with knee osteoarthritis.” BMC Musculoskeletal Disorders. 2021;22(1):205. https://pmc.ncbi.nlm.nih.gov/articles/PMC7944963/

4. Pereira TV, et al. “Safety of intra-articular hyaluronic acid for knee osteoarthritis: a systematic review.” Therapeutic Advances in Musculoskeletal Disease. 2017;9(12):297-308. https://pmc.ncbi.nlm.nih.gov/articles/PMC5726206/

5. Pal S, et al. “Post-injection flare after intra-articular injection of hyaluronic acid.” American Journal of Orthopedics. 2025. https://journals.healio.com/doi/10.3928/01477447-20250715-01

6. Strauss EJ, et al. “Hyaluronic acid viscosupplementation and osteoarthritis: current uses and future directions.” American Journal of Sports Medicine. 2009;37(8):1636-1644.

7. Petrella RJ, et al. “Effect of buffered vs non-buffered lidocaine on pain during injection.” Journal of Orthopaedic Research. 2025. https://pubmed.ncbi.nlm.nih.gov/41459126/

8. Creamer P. “The effect of a meditation monologue on pre-injection anxiety.” Journal of Integrative and Complementary Medicine. 2021;27(5):463-469. https://pmc.ncbi.nlm.nih.gov/articles/PMC8082977/

9. Navarro-Sarabia F, et al. “A 40-month multicentre, randomised placebo-controlled study to assess the efficacy and carry-over effect of repeated intra-articular injections of hyaluronic acid in knee osteoarthritis.” Annals of the Rheumatic Diseases. 2011;70(11):1957-1962.

10. Altman RD, et al. “Safety and efficacy of retreatment with a bioengineered hyaluronate for painful osteoarthritis of the knee.” Journal of Rheumatology. 2003;30(11):2376-2379.

11. Bhandari M, et al. “Post-injection inflammation and infection following intra-articular hyaluronic acid: a large-scale cohort analysis.” Osteoarthritis and Cartilage. 2022;30(2):256-264. https://pmc.ncbi.nlm.nih.gov/articles/PMC8808807/

12. CreakyJoints. “Intra-Articular Hyaluronate.” Patient Education Resource. Accessed March 2026. https://creakyjoints.org/education/treatments/intra-articular-hyaluronate/