Swelling after surgery is one of the most common and persistent aspects of recovery. Almost every surgical procedure causes some degree of swelling at the surgical site and often in the surrounding area. After knee replacement, your entire lower leg may swell. After abdominal surgery, bloating and puffiness around the incision are expected. After hand or wrist surgery, your fingers may feel tight and stiff.
This swelling is a normal part of the healing process. It is your body’s inflammatory response, sending extra blood flow and fluid to the area to begin repair. But while it is normal, it is also uncomfortable, and excessive or prolonged swelling can slow your recovery, increase pain, and limit your mobility.
This guide covers why swelling happens, what you can do to manage it effectively, and when it might signal something that needs medical attention.
Why surgery causes swelling
When tissue is cut during surgery, your body responds by increasing blood flow to the area. The small blood vessels in the surrounding tissue become more permeable, allowing fluid and white blood cells to move into the tissue to begin the healing process. This accumulation of fluid is what causes the visible swelling.
The extent of swelling depends on several factors: the type and location of surgery, how much tissue was affected, your overall health, and how active you are in the days following surgery. Joint replacements, particularly knee replacements, tend to produce significant swelling because of the amount of tissue involved. Less invasive procedures typically produce less.
Swelling usually peaks between 48 and 72 hours after surgery and then begins to gradually reduce. However, some degree of swelling can persist for weeks or even months, particularly after major joint surgery.
Elevation
Elevation is the single most effective thing you can do to reduce post-surgical swelling. When the swollen area is raised above the level of your heart, gravity helps excess fluid drain away from the tissue and back into your circulatory system.
For leg and knee surgery: Lie down and place pillows under your calf so your foot is higher than your hip, and your hip is level with or slightly below your heart. The common mistake is putting a pillow directly under the knee, which does not elevate the lower leg enough and can push the knee into an uncomfortable position. Support the full length of your lower leg with two or three pillows.
For arm, hand, or shoulder surgery: Rest your arm on pillows beside you so your hand is above the level of your heart. When sitting, a stack of cushions on a table beside you can support your arm at the right height. When sleeping, see our guide on the best pillows after surgery for positioning advice.
For abdominal surgery: Elevation is less straightforward, but lying on your back with your upper body slightly elevated (using a wedge pillow or an adjustable bed) can help reduce fluid pooling around the incision.
Aim to keep the affected area elevated as much as possible in the first 48 to 72 hours, when swelling is at its worst. After that, elevate for at least 20 to 30 minutes several times a day, particularly after walking or any activity that increases swelling.
For more on positioning while resting, see our guide on how to sleep after surgery.
Ice and cold therapy
Cold therapy reduces swelling by constricting blood vessels, which limits the amount of fluid that enters the tissue. It also provides effective pain relief.
Products that may help: Ice pack wrap · Compression stockings · Gel ice packs
Use a cold pack or ice wrapped in a thin towel. Never apply ice directly to skin, as this can cause ice burns. A layer of fabric between the ice and your skin is essential.
Apply for 15 to 20 minutes at a time, then remove for at least 40 minutes before reapplying. Longer is not better. Prolonged cold exposure can damage the skin and underlying tissue.
Follow your surgical team’s specific advice. Some procedures, particularly those involving skin grafts or flaps, may have restrictions on using ice. Always check first.
Gel packs that can be frozen and refrozen are convenient and mouldable. Bags of frozen peas work in a pinch but should not be eaten after being thawed and refrozen. Purpose-made cryo cuffs that circulate cold water around a joint are available for knee and shoulder surgery and provide more consistent cooling.
Compression
Compression garments and bandages help reduce swelling by providing external pressure that limits fluid accumulation in the tissue.
Compression stockings are commonly prescribed after lower limb surgery and some abdominal procedures to reduce swelling and lower the risk of blood clots. Wear them as directed by your surgical team, which usually means keeping them on during the day and removing them at night or while bathing.
Compression bandages may be applied to your surgical site before you leave hospital. Follow your team’s instructions about when and how to remove or replace them. Do not wrap compression bandages too tightly yourself, as this can restrict circulation.
Compression sleeves are available for arm and hand surgery and work on the same principle.
If you notice numbness, tingling, increased pain, or colour changes in your fingers or toes while wearing compression, loosen or remove the garment and contact your team.
Movement
It sounds counterintuitive, but gentle movement is one of the best ways to reduce swelling. Your muscles act as pumps that push fluid through your lymphatic system and back into circulation. Without movement, fluid accumulates and swelling persists.
Walk regularly. Short, frequent walks are more effective at reducing swelling than one long walk. Aim for a few minutes of walking every hour or two during waking hours. See our guide on how to walk safely after surgery for advice on building up gradually.
Ankle pumps and foot circles. If your surgery was on your lower body, these simple exercises, pumping your feet up and down and making circles with your ankles, stimulate circulation in your lower legs. Your physiotherapist will likely recommend doing these regularly, including while resting with your legs elevated.
Gentle range-of-motion exercises prescribed by your physiotherapist help keep fluid moving in the area around your surgical site. Do these as instructed, even if the area feels stiff and tight.
Avoid sitting or standing in one position for too long. Both allow fluid to pool. If you are sitting, elevate your legs. If you must stand, shift your weight from foot to foot and take short walks. For tips on seated positioning, see our guide on how to sit comfortably after surgery.
Hydration and diet
Staying well hydrated helps your body process and remove excess fluid. It seems contradictory that drinking more water would reduce swelling, but dehydration actually causes your body to retain fluid, making swelling worse.
Drink at least six to eight glasses of water a day. More if you are taking medication that causes dry mouth or if the weather is warm.
Reduce your salt intake in the weeks after surgery. Excess sodium causes fluid retention, which worsens swelling. Avoid adding extra salt to food and be aware of high-sodium processed foods.
Eat protein-rich foods to support tissue repair. Protein is essential for healing and for maintaining the osmotic pressure that keeps fluid in your blood vessels rather than leaking into tissue.
The timeline for swelling
Understanding the typical timeline helps set realistic expectations:
Days one to three: Swelling increases and typically peaks. This is normal and expected.
Days three to seven: Swelling begins to reduce gradually. You may notice it worsens later in the day, particularly after walking, and improves overnight when you are lying down.
Weeks two to four: Swelling continues to reduce but may fluctuate. Good days and bad days are normal.
Weeks four to twelve: Most swelling resolves during this period, though the area may still feel slightly puffy or tight compared to normal.
Beyond three months: Some surgical sites, particularly after knee replacement, can retain mild swelling for six months or longer. This gradually resolves but can be frustrating.
When swelling may be a concern
Most post-surgical swelling is entirely normal, but certain patterns warrant contacting your surgical team:
Sudden increase in swelling after it had been improving, particularly if accompanied by increased pain, redness, or warmth. This could indicate infection or a haematoma.
Swelling in one calf that is significantly worse than the other, particularly if the calf feels tight, warm, or tender. This could indicate a deep vein thrombosis (blood clot) and needs urgent assessment.
Swelling that prevents you from bending or straightening a joint that your physiotherapist expects you to be moving by now.
Signs of skin breakdown over swollen areas, such as blistering, shiny tight skin, or weeping fluid.
If you are unsure whether your swelling is normal, a quick call to your surgical team or family doctor’s office is always worthwhile. It is far better to check and be reassured than to ignore something that needs attention.
Patience with the process
Swelling is one of the most visible reminders that your body is healing. It can be frustrating, particularly when it persists longer than expected or fluctuates day to day. The key is consistency: keep elevating, keep moving gently, keep hydrating, and keep following your surgical team’s advice.
It does resolve. It just takes its own time.
Swelling is your body’s first response to healing. Managing it well gives your recovery the best possible foundation.
*Always follow the specific guidance of your surgical team, as recommendations for managing swelling vary by procedure and individual circumstances.*