Causes of Swollen Legs: Common Conditions and Their Symptoms

Swollen legs, medically known as peripheral edema, can be a sign of various underlying health conditions. This symptom occurs when excess fluid builds up in the tissues of the lower extremities. Here, we explore some common causes of leg swelling and their associated symptoms.

Heart Failure

Description: Heart failure occurs when the heart is unable to pump blood effectively, leading to a buildup of fluid in the body, including the legs.


  • Shortness of breath
  • Fatigue
  • Rapid or irregular heartbeat
  • Persistent cough or wheezing with white or pink blood-tinged phlegm
  • Swelling in the abdomen (ascites)

Chronic Venous Insufficiency

Description: This condition occurs when the veins in the legs are unable to return blood to the heart efficiently, causing blood to pool in the legs.


  • Aching or heaviness in the legs
  • Itching or tingling in the legs
  • Skin discoloration around the ankles
  • Varicose veins
  • Leg cramps

Deep Vein Thrombosis (DVT)

Description: DVT is the formation of a blood clot in a deep vein, usually in the leg. This can cause significant swelling and can be life-threatening if the clot travels to the lungs.


  • Sudden swelling in one leg
  • Pain or tenderness in the leg, often starting in the calf
  • Warmth in the affected leg
  • Red or discolored skin on the leg

Kidney Disease

Description: The kidneys filter waste and excess fluids from the blood. When they are not functioning properly, fluid can accumulate in the body, including the legs.


  • Fatigue
  • Shortness of breath
  • Nausea
  • Swelling around the eyes, especially in the morning
  • Frequent urination, especially at night
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Liver Disease

Description: Conditions like cirrhosis can cause the liver to become scarred and malfunction, leading to fluid buildup in the abdomen and legs.


  • Jaundice (yellowing of the skin and eyes)
  • Abdominal pain and swelling
  • Itchy skin
  • Dark urine color
  • Pale stool color


Description: Lymphedema is swelling that generally occurs in one of your arms or legs. It can result from the removal of or damage to lymph nodes as part of cancer treatment.


  • Swelling of part or all of the leg or arm, including fingers or toes
  • A feeling of heaviness or tightness
  • Restricted range of motion
  • Recurring infections
  • Hardening and thickening of the skin (fibrosis)


Description: Bacterial or fungal infections can cause swelling and inflammation in the legs, especially if the skin is broken or compromised.


  • Redness and warmth in the affected area
  • Fever
  • Pain or tenderness
  • Pus or discharge from a wound


Description: Certain medications can cause fluid retention and swelling in the legs. Common culprits include nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroids, and some blood pressure medications.


  • Swelling in the legs and feet
  • Weight gain
  • Increased blood pressure (in some cases)
  • Changes in urination patterns


Description: During pregnancy, the body produces more blood and body fluids to support the developing baby. This can cause swelling in the legs, especially in the third trimester.


  • Generalized swelling in the legs, ankles, and feet
  • Pressure and heaviness in the legs
  • Visible veins


Description: Excess body weight can put additional pressure on the veins in the legs, leading to poor circulation and swelling.

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  • Persistent swelling in the legs, ankles, and feet
  • Difficulty walking or standing for long periods
  • Joint pain
  • Shortness of breath during physical activity

Inactivity or Prolonged Sitting/Standing

Description: Sitting or standing for extended periods can lead to poor blood circulation in the legs, causing fluid to accumulate.


  • Mild to moderate swelling in the legs and feet
  • Feeling of heaviness in the legs
  • Temporary relief with movement or elevation of legs

Hormonal Changes

Description: Hormonal fluctuations, particularly in women, can cause fluid retention and swelling. This is common during menstruation, pregnancy, and menopause.


  • Cyclical swelling corresponding with menstrual cycle
  • Generalized swelling in the legs and feet
  • Breast tenderness
  • Mood swings


Swollen legs can be a symptom of various conditions ranging from mild to serious. It’s important to consult a healthcare professional to determine the underlying cause and appropriate treatment. Early diagnosis and intervention can prevent complications and improve quality of life. If you experience sudden or severe swelling, especially with pain, redness, or shortness of breath, seek medical attention immediately, as this could be a sign of a serious condition like DVT or heart failure.

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