Compression socks are recommended for a surprisingly wide range of people, from those with diagnosed vein conditions to pregnant women, frequent travelers, post-surgical patients, and workers who stand all day. They work by applying graduated pressure to your lower legs, squeezing blood back toward your heart and preventing it from pooling in your veins. Whether you need them depends on your health, your daily routine, and your specific symptoms.
People With Chronic Venous Insufficiency
The most established use for compression socks is chronic venous insufficiency (CVI), a condition where the valves in your leg veins don’t close properly, allowing blood to flow backward and pool. This leads to swelling, aching, skin changes, and visible varicose veins. Compression therapy is a first-line treatment across all stages of the disease.
Even in early stages, when symptoms are limited to leg heaviness, aching, or mild spider veins, low-pressure compression stockings (typically 20 to 30 mmHg) significantly reduce pain, leg cramps, and restlessness. In more advanced stages, where the skin becomes discolored, hardened, or develops ulcers, compression helps reverse those changes by improving circulation and reducing fluid buildup. A randomized study comparing compression stockings to sclerotherapy (a vein-closing injection) found that stockings provided significant relief of aching, pain, cramps, and restlessness on their own.
Long-Distance Travelers
Anyone traveling for more than four hours, whether by plane, car, or bus, faces an elevated risk of blood clots in the legs. Sitting in a cramped position for hours slows blood flow, and the combination of dehydration and low cabin pressure on flights makes things worse. The CDC notes that more than 300 million people take long-distance flights each year, and graduated compression stockings are one of the recommended strategies for reducing clot risk during travel.
You don’t need a diagnosed condition to benefit. If you’re flying cross-country or taking a long road trip, compression socks help keep blood moving through your calves during those hours of inactivity. People with additional risk factors, such as obesity, recent surgery, use of hormonal birth control, or a personal history of blood clots, have even more reason to wear them.
Pregnant Women
During pregnancy, your body produces roughly 50% more blood and fluid than usual. That extra volume, combined with a growing uterus pressing on pelvic veins, often causes noticeable swelling in the legs, ankles, and feet, particularly in the second and third trimesters. Compression socks apply gentle pressure that counteracts this fluid buildup.
Pregnancy also increases the chance of developing varicose veins. The valves inside leg veins can weaken under the increased blood volume and hormonal changes, letting blood collect and stretch the vein walls. Compression improves circulation enough to reduce the size of these veins and slow the formation of new ones. Many women start wearing them around week 20 and continue through delivery.
People With POTS
Postural orthostatic tachycardia syndrome (POTS) causes your heart rate to spike when you stand up, often accompanied by dizziness, lightheadedness, and fatigue. The underlying problem is that blood pools excessively in the legs and abdomen because the blood vessels don’t tighten properly when you change position. Your heart then races to compensate for the reduced blood reaching your brain.
Compression garments push blood back toward the heart, increasing the amount of blood your heart pumps with each beat and reducing that compensatory spike in heart rate. For POTS, the pressure needs to be higher than what casual wearers typically use. Clinical guidelines call for 30 to 40 mmHg of pressure to meaningfully reduce venous pooling. Waist-high compression garments that also cover the abdomen tend to be more effective than knee-high socks alone, since blood pools in the belly as well as the legs.
Workers Who Stand or Sit All Day
Nurses, retail workers, teachers, factory workers, and others who spend eight or more hours on their feet are at particular risk for occupational leg swelling. Research on healthcare workers pulling 12-hour shifts found significant increases in leg volume regardless of whether the shift was during the day or at night. The longer the hours, the worse the swelling and associated symptoms: heaviness, aching, and fatigue.
Compression stockings are the most effective countermeasure studied for this kind of occupational edema. In one study, they were the only method that meaningfully reduced lower-limb swelling, and participants rated them as the most effective treatment option when surveyed. The catch is that the benefits only last while you’re wearing them. Once workers stopped using compression, symptoms came back. This makes them a daily-use tool rather than a short-term fix.
The same logic applies to people with sedentary desk jobs. Sitting for hours with your legs bent at the knee restricts blood flow in similar ways, and compression socks can reduce the end-of-day heaviness that comes with prolonged sitting.
Patients Recovering From Surgery
Surgery is one of the strongest risk factors for deep vein thrombosis (DVT), the formation of dangerous blood clots in the legs. Anesthesia, immobility during the procedure, and reduced activity during recovery all slow blood flow and increase clotting risk. UK guidelines from the National Institute for Health and Care Excellence (NICE) recommend that all surgical inpatients wear graduated compression stockings from admission until they return to their usual level of mobility.
For patients at the highest risk, compression stockings are used alongside blood-thinning medications for added protection. After discharge, the recommendation is to keep wearing them until you’re fully mobile again. Your surgical team should provide guidance on how long that means for your specific procedure, but it often ranges from a few days to several weeks depending on the surgery and how quickly you’re moving around.
Athletes and Active People
The evidence here is more nuanced than marketing would suggest. Compression socks do not appear to improve athletic performance during exercise. Despite a logical theory that they’d help clear lactic acid from muscles by boosting circulation, most studies in athletes show little or no effect on lactate levels during activity.
Where the evidence is more consistent is recovery. Multiple reviews have found that wearing compression socks after exercise reduces muscle soreness, delayed-onset muscle soreness (the stiffness you feel a day or two later), and markers of inflammation. One study also found faster lactate removal after exercise in athletes wearing below-knee compression. So while they probably won’t make you run faster, they may help you recover faster and feel less sore the next day.
Who Should Avoid Compression Socks
Compression socks are not safe for everyone. The primary concern is peripheral artery disease (PAD), a condition where narrowed arteries already restrict blood flow to the legs. Adding external pressure on top of poor arterial circulation can reduce blood supply to dangerous levels. Clinical guidelines consider compression contraindicated when the ankle-brachial index (a ratio comparing blood pressure in the ankle to the arm) falls below 0.5, or when ankle blood pressure is below 60 mmHg.
People with skin infections, open wounds on the legs, or severe nerve damage (where you might not feel if the stockings are too tight) should also avoid them without medical guidance. If you have any known circulatory problems in your legs, get clearance before using compression.
Getting the Right Fit
Compression socks only work properly if they fit correctly. Too loose and they won’t apply enough pressure. Too tight and they can restrict circulation, bunch behind the knee, or create painful pressure points.
For knee-high socks, you need two measurements: the circumference of your calf at its widest point, and the length from the back of your heel to the bend of your knee. For thigh-high stockings, add the circumference of your upper thigh at the buttock fold and the full length from heel to buttock fold. Take measurements in the morning before any swelling develops, since your legs are closest to their true size after a night of rest.
Pressure levels matter too. Light compression (up to 20 mmHg) works for travel, mild swelling, and occupational fatigue. Moderate compression (20 to 30 mmHg) suits varicose veins and more significant edema. Firm compression (30 to 40 mmHg) is typically reserved for diagnosed conditions like POTS, advanced venous insufficiency, or post-surgical recovery, and usually requires a prescription or professional fitting.