Medity Health

August 20, 2026

If you've shopped for compression garments, you've probably noticed a number followed by "mmHg" on the packaging (something like 15-20 mmHg or 20-30 mmHg). That number matters more than the size, color, or brand. It tells you exactly how much pressure the garment applies, which determines what it's good for and who should be wearing it.

Here's a plain-language breakdown so you can choose the right compression level with confidence.

mmHg stands for "millimeters of mercury" — the same unit used to measure blood pressure. In compression garments, it refers to how much pressure is applied to your leg, arm, or other body part, and where.

Most compression garments use graduated compression, meaning the pressure is highest at the point farthest from your heart (like your ankle) and gradually decreases as it moves upward (toward your calf, knee, or thigh). This gradient is what helps push blood and fluid back toward your heart instead of letting it pool in your lower legs.

Best for mild swelling, tired legs from standing or sitting all day, pregnancy related discomfort, general prevention for varicose veins, and everyday travel. This is one of the most popular over the counter levels, enough support to notice a difference without feeling overly restrictive.

Common uses include:

• Reducing muscle fatigue
• Improving circulation
• Traveling
• Mild to moderate varicose veins
• Mild swelling and edema

20-30 mmHg (Moderate) - Best for moderate edema, varicose veins, post-surgical recovery (as directed by a doctor), prevention of blood clots (DVT) during travel, chronic venous insufficiency. This level is often recommended by doctors and may require a consultation, especially if you have an underlying medical condition. Many post-surgical compression garments start in this range.

Common uses include:

• Moderate varicose veins and venous disorders.
• Deep vein thrombosis (DVT) prevention and management.
• Post-surgery recovery and rehabilitation.
• Mild to moderate edema or lymphedema

30-40 mmHg (Firm) - Best for significant swelling, lymphedema, advanced venous disease, post-surgical recovery for certain procedures, severe varicose veins, neuropathy. These garments exert one of the highest levels of pressure and are typically prescribed for more serious medical conditions. It's recommended to use these types of garments under the guidance of a healthcare practitioner.

Common uses include:

• Moderate to severe edema and lymphedema management.
• Chronic venous insufficiency.
• Prevention of ulcer recurrence.

40-50+ mmHg (Very Firm): Best for severe lymphedema, advanced chronic venous insufficiency, specific post-surgical protocols. This is typically used under close medical supervision, often as part of a broader treatment plan involving a lymphedema therapist or vascular specialist.

A few guiding questions can help:

• Are you managing a diagnosed medical condition (such as lymphedema, a history of DVT, or chronic venous insufficiency)? Talk to your doctor before choosing a level. You may need 20-30 mmHg or higher, and a proper fitting matters as much as the number itself.
• Are you recovering from surgery? Follow your surgeon's specific recommendation. Post-op compression needs often change over the course of recovery (higher compression early on, tapering down later).
• Are you looking for everyday comfort or prevention? Start at 15-20 mmHg. It's enough to feel supportive without being uncomfortable for all-day wear.
• Are you an athlete or frequent traveler? 15-20 mmHg or 20-30 mmHg are both common choices depending on personal preference and how long you'll be wearing them.

• Higher isn't always better. More compression isn't automatically more effective, and the right level depends on your specific need. Too much compression without medical guidance can cause discomfort or even restrict circulation.
• When in doubt, ask. If you're unsure which level is right for you, especially for medical or post surgical use, check with your doctor or reach out to us. We're happy to help you figure out the right fit and pressure for your situation.
• Fit matters as much as mmHg. A 20-30 mmHg garment that's the wrong size won't deliver the pressure listed on the label. It might apply too much or too little, and unevenly. Always size based on accurate measurements, and check the sizing charts located on the page of the product you're ordering.

Compression level isn't a one size fits all number. It's a tool that should match your specific need, whether that's everyday comfort, travel support, or a medically necessary part of recovery or treatment. Understanding the mmHg scale takes the guesswork out of shopping and helps you get the real benefit compression garments are designed to provide.

Not sure which compression level is right for you? Give us a call or check with your healthcare provider for personalized guidance.

If you have any questions about the compression level you need or what garment is best for you, reach out to us at support@medityhealth.com or give us a call at (866) 945-4766.

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