Salt helps your body maintain normal fluid balance, but consuming more sodium than your body needs can encourage fluid retention.
Sodium is found in more than table salt. Packaged snacks, canned soups, processed meats, instant meals, restaurant dishes, and many sauces can contain substantial amounts.
If you have a salty meal and notice mild puffiness afterward, temporary fluid retention may be one explanation. People with certain health conditions, including heart or kidney disease, may be more sensitive to excess sodium.
What may help?
Choose more fresh or minimally processed foods.
Check nutrition labels for sodium content.
Use herbs, spices, lemon, or garlic to add flavor.
Follow any sodium recommendations given by your healthcare professional.
Reducing excess sodium may help some people, but swelling that persists or occurs with other symptoms needs further assessment.
3. Hot Weather
Warm weather can make your feet and ankles swell, particularly if you spend long periods outdoors or on your feet.
Heat causes blood vessels near the skin to widen, helping your body release heat. This change can encourage fluid to collect in the lower limbs, especially when combined with prolonged standing or sitting.
Heat-related swelling is often mild and affects both feet. It may improve when you move to a cooler environment, walk gently, or elevate your legs.
Try these simple measures:
Take breaks in a cool place.
Avoid sitting or standing in one position for too long.
Move your ankles and walk gently.
Elevate your legs when resting.
Drink fluids regularly, unless a healthcare professional has prescribed fluid restriction.
Don't assume that swelling is caused by the heat if it is sudden, severe, painful, or accompanied by breathing difficulties, chest pain, or other concerning symptoms.
4. Pregnancy
Swollen feet and ankles are common during pregnancy, particularly in the later months. The growing uterus places pressure on veins that return blood from the legs to the heart, while hormonal changes also affect how the body handles fluid.
Mild swelling that gradually develops in both feet can be a normal part of pregnancy. However, new or sudden swelling during pregnancy can sometimes be a warning sign of preeclampsia, a potentially serious pregnancy complication involving high blood pressure and other organ changes.
Contact your maternity care team promptly if swelling appears suddenly or increases significantly, especially if you also experience:
A severe or persistent headache
Blurred vision or flashing lights
Pain in the upper abdomen
Nausea or vomiting that is unusual for you
Shortness of breath
High blood pressure, if measured
Seek urgent medical assessment for these symptoms rather than trying to treat the swelling at home.
For ordinary pregnancy-related swelling, gentle movement and resting with your feet elevated may help. Ask your maternity care professional before using compression garments or making significant changes to your fluid intake.
5. Venous Insufficiency or Varicose Veins
Your veins contain valves that help keep blood moving toward the heart. When these valves become weakened or damaged, blood can collect in the legs instead of flowing upward efficiently.
This is known as chronic venous insufficiency. It can cause recurring swelling around the ankles and lower legs, particularly after standing or sitting for a long time.
Other clues may include:
Aching or heaviness in the legs
Visible, enlarged varicose veins
Itching around the lower legs
Brownish skin discoloration near the ankles
Swelling that worsens later in the day
Skin changes or sores in more advanced cases
Treatment depends on the severity and underlying cause. A healthcare professional may recommend regular walking, leg elevation, compression therapy, or other treatments.
Compression stockings are not suitable for everyone, particularly people with certain arterial circulation problems. Get medical advice before using them if you have unexplained swelling or known circulation disease.
6. A Blood Clot in a Deep Vein
One of the most important causes to recognize is deep vein thrombosis (DVT), a blood clot in a deep vein, usually in the leg.
A DVT may block blood flow and cause swelling, pain, tenderness, warmth, or redness. It often affects one leg rather than both, although symptoms vary and some people have few noticeable symptoms.
Risk factors can include recent surgery, hospitalization, prolonged immobility, certain cancers, pregnancy and the period after delivery, estrogen-containing medications, and a previous blood clot.
Sudden swelling in one leg—especially with pain, warmth, or redness—needs urgent medical assessment. Do not massage the affected leg or wait to see whether the swelling disappears.
A blood clot can become life-threatening if part of it travels to the lungs, causing a pulmonary embolism.
Call emergency services immediately if leg swelling occurs with sudden shortness of breath, chest pain, coughing up blood, fainting, or severe dizziness.
7. Heart Problems, Including Heart Failure
The heart helps circulate blood throughout the body. When it cannot pump effectively enough, pressure can build up in the veins, and fluid may accumulate in the legs and other tissues.
Heart failure can cause swelling in both feet and ankles, but swelling alone does not establish that someone has heart disease.
Other possible symptoms include:
Shortness of breath during activity or while lying down
Waking at night feeling breathless
Unusual fatigue or weakness
Rapid or unexplained weight gain from fluid retention
Abdominal swelling
A persistent cough in some cases
If you notice new swelling along with worsening breathlessness, arrange prompt medical assessment. Severe breathing difficulty or chest pain requires emergency care.
Treatment depends on the underlying heart condition and may include medication, dietary changes, and monitoring fluid balance. Do not start taking water pills or diuretics on your own, as they can affect blood pressure, kidney function, and electrolyte levels.
8. Kidney Problems
Your kidneys help remove excess fluid and waste products from your blood. When they aren't functioning properly, fluid and sodium may accumulate in the body, leading to swelling.
Kidney-related swelling may affect both feet and ankles. Depending on the condition, swelling can also appear around the eyes, particularly in the morning.
Other possible signs include:
Changes in how often you urinate
Foamy urine
Blood in the urine
Unusual tiredness
Nausea or reduced appetite
High blood pressure
Some kidney conditions cause few noticeable symptoms early on, so the absence of pain doesn't necessarily mean everything is fine.
A healthcare professional may recommend blood tests, urine tests, blood pressure checks, or other investigations to assess kidney function.
If swelling is new, persistent, or accompanied by changes in urination, arrange a medical appointment. Severe shortness of breath, confusion, or a major reduction in urine output warrants urgent assessment.
9. Liver Disease
The liver produces albumin, a protein that helps keep fluid within blood vessels. Certain liver conditions can reduce albumin levels and contribute to fluid buildup. Liver disease can also increase pressure in veins that carry blood through the liver.
As a result, some people with advanced liver disease develop swelling in the feet and ankles, fluid in the abdomen, or both.
Other possible warning signs include:
Yellowing of the skin or whites of the eyes
A swollen or enlarged abdomen
Easy bruising
Persistent fatigue
Reduced appetite
Dark urine or unusually pale stools
These symptoms can have several causes, so they should be assessed rather than used to self-diagnose liver disease.
Persistent swelling accompanied by abdominal enlargement, jaundice, or other new symptoms deserves prompt medical attention.
10. Medication Side Effects
Sometimes, swollen feet and ankles are linked to a medication rather than a new disease.
Medicines that can contribute to swelling include certain blood pressure drugs, particularly calcium channel blockers such as amlodipine; nonsteroidal anti-inflammatory drugs (NSAIDs), such as ibuprofen; corticosteroids; some diabetes medications; and certain hormone treatments.
The swelling may begin after starting a medicine or increasing its dose. However, timing alone cannot prove that a medication is responsible.
If you suspect a medication is causing swelling:
Note when the swelling started and whether your medication changed recently.
Make a list of prescription medicines, over-the-counter products, and supplements you take.
Contact your prescriber or pharmacist to discuss the symptoms.
Ask whether the dose or medication needs to be adjusted.
Do not stop a prescribed medication or change its dose without medical advice. Some medicines need to be reduced gradually, and untreated underlying conditions can also be dangerous.
Other Possible Reasons for Swollen Feet
The ten causes above are important possibilities, but they aren't the only explanations.
Swelling can also occur with injuries, skin infections, inflammation, lymphatic system problems, or conditions that affect circulation. An ankle sprain, for example, may cause swelling around one joint, while an infection can cause redness, warmth, tenderness, and sometimes fever.
If swelling begins after an injury, is accompanied by a hot or red area, or keeps returning without an obvious explanation, seek medical advice.
Warning Signs: When Is Foot or Ankle Swelling an Emergency?
Swelling isn't always dangerous, but certain symptoms should never be ignored.
Call emergency services immediately if you have:
Sudden shortness of breath, especially with new leg swelling
Chest pain or tightness, particularly if it worsens with breathing
Coughing up blood
Fainting, collapse, or severe dizziness alongside possible clot symptoms
Severe difficulty breathing or rapidly worsening symptoms
These signs can indicate a pulmonary embolism, serious heart or lung problem, or another emergency.
Seek urgent medical assessment if you notice:
Sudden swelling in one leg, especially with pain, warmth, or redness
Rapidly increasing swelling without a clear explanation
A red, hot, painful area of skin, particularly with fever
New swelling during pregnancy, especially with headache, visual changes, or upper abdominal pain
Significant swelling accompanied by much less urine than usual or other serious new symptoms
When a blood clot is possible, don't wait for all the classic symptoms to appear. A healthcare professional can determine whether urgent testing is needed.
When Should You Make a Doctor's Appointment?
Even without emergency symptoms, it's worth arranging an appointment if swelling:
Persists for several days without a clear explanation
Keeps coming back
Gradually gets worse
Affects your daily activities or makes walking uncomfortable
Occurs with unexplained weight gain
Appears alongside changes in urination, skin color, or energy levels
Develops after starting a new medication
People with known heart, kidney, liver, or circulation problems should follow the advice of their care team about when to report swelling.
There is no single duration that makes swelling safe to ignore. The cause, severity, associated symptoms, and your medical history all matter.
How Do Doctors Find the Cause of Swollen Feet and Ankles?
A clinician will usually begin by asking when the swelling started, whether one or both legs are affected, whether it improves overnight, and what other symptoms you have.
They may ask about recent travel, surgery, pregnancy, medication changes, injuries, and your medical history.
Depending on what they find, assessment may include:
A physical examination: Checking the swelling, skin, pulses, and other signs of circulation or fluid buildup.
Blood tests: Assessing kidney function, liver function, electrolytes, or other possible causes.
Urine tests: Looking for protein or other changes that may indicate kidney problems.
Ultrasound: Evaluating blood flow or checking for a possible blood clot.
Heart investigations: Such as an electrocardiogram or other tests if a heart problem is suspected.
Not everyone needs every test. The appropriate evaluation depends on the symptoms and the likely cause.
What Can Help Reduce Mild Foot and Ankle Swelling?
If swelling is mild, affects both feet, and has an obvious trigger such as prolonged sitting, a few simple measures may help. These steps are not a substitute for medical assessment when swelling is sudden, unexplained, persistent, or accompanied by warning signs.
Elevate your legs
When resting, support your legs on pillows so your feet are raised. Elevation can help fluid move away from the lower limbs.
If you have heart or breathing problems, follow your healthcare professional's advice about comfortable positioning.
Move regularly
Walking and gentle ankle movements activate the calf muscles, which help move blood back toward the heart.
If you sit for long periods, take regular movement breaks when possible. On long journeys, flex and extend your ankles and walk around when it is safe to do so.
Reduce excess sodium
If your diet contains lots of highly processed or salty foods, choosing lower-sodium alternatives may help reduce fluid retention.
If you have a condition requiring a specific diet, follow the recommendations of your healthcare team rather than making major changes on your own.
Wear comfortable footwear
Tight shoes and socks can make swollen feet feel more uncomfortable. Choose footwear that fits properly and doesn't place pressure on the affected area.
Avoid tight bands around the ankles or calves.
Ask before using compression stockings
Compression garments can help some people with venous insufficiency, but they're not appropriate for everyone. A healthcare professional can advise whether they're suitable and what level of compression is needed.
Don't take diuretics without medical guidance
Diuretics, sometimes called water pills, help the body remove excess fluid. They can be useful for certain medical conditions, but they aren't the right treatment for every type of swelling.
Taking them without guidance can lead to dehydration, electrolyte disturbances, low blood pressure, or kidney problems.
How to Help Prevent Recurring Swelling
Not every cause of edema can be prevented, but certain habits may reduce swelling related to inactivity or fluid retention.
Move throughout the day rather than remaining seated for hours.
Take breaks during long periods of standing.
Follow dietary advice about sodium if fluid retention is a concern.
Maintain a healthy activity routine suited to your abilities.
Take prescribed medicines as directed and discuss side effects with your clinician.
Follow your care team's guidance if you have heart, kidney, liver, or vein problems.
During long journeys, move your legs regularly and walk when practical.
If swelling keeps returning, don't rely on lifestyle changes alone. Identifying and treating the underlying cause is the most effective way to manage recurring edema.
Frequently Asked Questions
Can dehydration cause swollen feet and ankles?
Dehydration is not the usual direct explanation for swollen ankles. However, fluid balance can be affected by illness, medications, and underlying health conditions. Avoid deliberately restricting or excessively increasing your fluid intake to treat swelling. Follow medical advice, especially if you have heart or kidney disease.
Why are my ankles swollen when I wake up?
Swelling can change with body position and fluid movement. Some people notice more swelling later in the day, while others have persistent swelling overnight. Puffiness around the eyes in the morning can sometimes occur with kidney-related problems. New or unexplained morning swelling should be assessed if it persists or comes with other symptoms.
Is swelling in both feet less serious than swelling in one foot?
Not necessarily. Swelling in both feet may occur with fluid retention, medication side effects, venous problems, or heart, kidney, or liver conditions. Sudden swelling in one leg raises concern for a blood clot or local injury, but the pattern alone cannot establish the cause.
Can walking help swollen ankles?
Gentle walking can help when swelling is related to prolonged sitting or standing because calf-muscle movement supports blood flow. However, don't try to walk off sudden, painful, unexplained swelling in one leg. Seek urgent medical assessment if a clot is possible.
Can high blood pressure cause swollen feet?
High blood pressure itself doesn't always cause noticeable ankle swelling. However, some blood pressure medications can cause swelling, and long-standing high blood pressure can damage the heart or kidneys, which may contribute to fluid buildup. A clinician can help distinguish between these possibilities.
Should I massage swollen feet?
Gentle massage isn't appropriate for every cause of swelling. Avoid massaging a leg that is suddenly swollen, painful, warm, or red until a blood clot has been ruled out. If swelling is persistent, ask a healthcare professional whether massage is suitable for your situation.
How long does edema last?
The duration depends on its cause. Swelling related to prolonged standing or warm weather may improve with rest and cooling, while swelling from medication or an underlying medical condition may persist until the cause is addressed. Ongoing or worsening swelling deserves medical evaluation.
Can swollen feet be a sign of heart failure?
Yes, swelling in both feet and ankles can be a symptom of heart failure, especially when accompanied by breathlessness, fatigue, difficulty lying flat, or rapid weight gain. Swelling alone doesn't diagnose heart failure, but new swelling with these symptoms should be assessed promptly.
Can I take a water pill for swollen ankles?
Don't take a diuretic unless it has been prescribed or recommended for your particular situation. The appropriate treatment depends on the cause of swelling, and diuretics can cause serious side effects when used incorrectly.
When should I worry about swollen feet during pregnancy?
Mild swelling can be common during pregnancy, but sudden or significant swelling—particularly when accompanied by a severe headache, visual changes, upper abdominal pain, or shortness of breath—requires prompt medical assessment. Contact your maternity care team rather than assuming it is ordinary pregnancy swelling.
The Bottom Line
Swollen feet and ankles can be caused by something as ordinary as spending too long on your feet, sitting through a long journey, or being exposed to hot weather. But edema can also be associated with medication side effects, circulation problems, blood clots, and conditions affecting the heart, kidneys, or liver.
The most important thing is to notice the pattern. Is the swelling mild or severe? Does it affect one leg or both? Does it improve with rest, or does it keep returning? Are there other symptoms such as pain, redness, breathlessness, or changes in urination?
Seek emergency help for swelling accompanied by sudden shortness of breath, chest pain, coughing up blood, or collapse. Get urgent medical assessment for sudden swelling in one leg, particularly if it is painful, warm, or red.
For swelling that persists, worsens, or has no clear explanation, arrange a medical appointment rather than simply waiting for it to disappear. Early assessment can help identify the cause and guide the right treatment.
Your feet carry you through everyday life. Paying attention when something changes is a simple but important way to look after your health.
Medical Disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Swollen feet and ankles can have many causes, and symptoms alone cannot reliably identify the underlying condition. Seek advice from a qualified healthcare professional about new, persistent, or unexplained swelling. If you think you may be experiencing a medical emergency, contact local emergency services immediately.
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