What Swollen Feet Are Trying to Tell You
Swelling in the feet and ankles is your body communicating something — here's how to listen
Swollen feet and ankles are so common that many people have stopped paying attention to them. They accept puffiness at the end of a long day as normal, kick off their shoes in relief, and move on. And while some degree of fluid accumulation after a hot day or a long stretch of standing is perfectly benign, foot and ankle swelling can also be one of the body's most important warning signals.
As nurses, we look at the feet with a clinical eye — and swelling is always something we take seriously and recommend be investigated, because the cause matters enormously. Here's what you need to know.
How Swelling Happens
Swelling in the feet and ankles — medically called edema — occurs when fluid accumulates in the tissues of the lower extremities. Under normal circumstances, the body manages fluid balance carefully: fluid moves out of the blood vessels to nourish surrounding tissues, and then returns to the bloodstream through the lymphatic system and venous circulation.
When something disrupts this process — whether it's gravity, venous weakness, cardiac function, kidney function, lymphatic damage, or inflammation — fluid begins to accumulate in the lower limbs, because that's where gravity pulls it. The result is swelling that may be mild and temporary, or persistent and progressive, depending on the cause.
Common Causes of Foot and Ankle Swelling
Not all swelling is created equal. Understanding the cause is essential to knowing how to respond. Here are the most common reasons feet and ankles swell:
Prolonged sitting or standing. One of the most common and benign causes. When the calf muscles aren't pumping blood actively, fluid pools in the lower legs. This typically resolves with movement and elevation.
Heat. Warm weather causes blood vessels to dilate, which can allow more fluid to leak into surrounding tissues. Summer swelling that resolves overnight is generally benign — but worth monitoring.
Chronic venous insufficiency. When the veins in the legs struggle to return blood efficiently to the heart, fluid accumulates in the lower legs over the course of the day. This typically worsens toward evening and improves with elevation overnight.
Lymphedema. Damage or dysfunction of the lymphatic system — whether from surgery, infection, or other causes — results in fluid accumulation that does not resolve with elevation alone. This type of swelling requires specific management.
Cardiac conditions. Heart failure can cause fluid to back up in the body, including the lower legs and feet. This is typically bilateral (both legs) and may be accompanied by other symptoms such as shortness of breath or fatigue.
Kidney or liver conditions. Both the kidneys and liver play roles in fluid balance. Dysfunction of either can result in fluid retention throughout the body, including in the feet and ankles.
Medication side effects. A number of commonly prescribed medications can cause fluid retention, including certain blood pressure medications (particularly calcium channel blockers), corticosteroids, and some diabetic medications. If swelling began or worsened after starting a new medication, this is worth noting and discussing with your prescriber.
Pregnancy. Swelling is extremely common during pregnancy, particularly in the third trimester, as the growing uterus puts pressure on the veins returning blood from the legs. Compression stockings are often recommended during pregnancy for this reason.
Infection or injury. Localized swelling in one foot or ankle — particularly if accompanied by redness, warmth, and pain — may indicate infection or injury and warrants prompt medical attention.
When to Seek Medical Attention Right Away
Not all swelling can wait for a routine appointment. Seek prompt medical care if you experience:
Sudden swelling in one leg that is not explained by injury — this may indicate a deep vein thrombosis (blood clot) and requires immediate assessment
Swelling accompanied by chest pain, shortness of breath, or rapid heartbeat — this may indicate a cardiac emergency
Swelling with redness, warmth, and increasing pain — particularly if you have diabetes or compromised circulation, as this may indicate infection
Swelling that begins suddenly and is significantly worse than usual, or is accompanied by other new symptoms
A wound or skin breakdown in an area that is swollen — the combination increases infection risk significantly
When in doubt, always err on the side of getting it checked. Your instinct that something feels different is worth listening to.
How We Assess Swelling at Sole Renewal
When you come in to see us with swollen feet or ankles, our assessment goes beyond simply noting the swelling. We look at the pattern, the severity, and the characteristics of the edema — including whether it pits when pressed, which side or sides are affected, how long it has been present, and what makes it better or worse.
We also assess skin integrity in the swollen area, check circulation and sensation, look for any associated skin changes, and review your health history and medications for contributing factors.
Where we have concerns that fall outside the scope of what we manage, we will tell you clearly and recommend that you follow up with your family physician or the appropriate specialist. Our job is not just to treat what's in front of us — it's to make sure nothing important is missed.
What Helps — and What Doesn't
For swelling that is benign and related to heat, prolonged sitting, or standing, the following strategies can provide meaningful relief:
Compression stockings. The single most effective tool for managing day-to-day swelling related to venous insufficiency or prolonged standing. Worn from the start of the day before swelling begins, they make a significant difference. We carry Sigvaris compression stockings and can fit you properly.
Elevation. Raising your feet above the level of your heart allows gravity to assist fluid in draining back toward the core. Even 20–30 minutes of elevation in the evening can noticeably reduce overnight swelling.
Movement. Regular walking activates the calf muscle pump, which is one of the most important mechanisms for returning blood from the lower legs. Avoid long periods of sitting or standing without breaks.
Reduce sodium intake. High sodium in the diet causes the body to retain water. If you notice swelling worsening after saltier meals, this may be a contributing factor.
Stay hydrated. Counterintuitively, drinking adequate water helps the body regulate fluid balance more effectively.
What doesn't help: sitting with your feet down all evening, wearing tight footwear that restricts circulation, and ignoring swelling that's been there for weeks or months in the hope that it will resolve on its own.
Swelling Is a Signal. Let's Figure Out What It's Saying.
Whether your swelling is mild and occasional or persistent and progressive, a professional assessment is always the right move. We'll look carefully at your feet and ankles, review your history, and help you understand what's happening and what to do about it — with a plan tailored specifically to you.
Book an appointment at www.solerenewalfootcare.ca. Your body is trying to tell you something — let's listen together.
— Natalie Doucet, RPN | Sole Renewal Footcare & Wellness | Oshawa, Ontario
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