What causes left leg to swell?

What Causes Left Leg to Swell?

Leg swelling, a condition also known as edema, is a common issue that affects many people. It is characterized by the accumulation of fluids in the legs or feet, causing them to become swollen and painful. The condition can affect one or both legs, depending on the cause. Swelling in the left leg can be a sign of an underlying health condition that requires medical attention. In this article, we will explore some of the common causes of left leg swelling, their symptoms, and treatment options.

Causes of Left Leg Swelling

Left leg swelling can be caused by various factors that include:

  • Deep vein thrombosis (DVT): This occurs when blood clots form in the deep veins of the leg, leading to swelling, pain, and other complications. DVT can be a severe medical condition that requires immediate medical attention.
  • Injury: Leg swelling can result from an injury or trauma to the leg. It is often characterized by pain, inflammation, and a reduced range of motion.
  • Surgery: Swelling can occur after surgery, especially if it involves the leg, knee, or foot.
  • Pregnancy: During pregnancy, hormonal changes can cause fluid accumulation in the legs, leading to swelling.
  • Heart, liver, or kidney failure: Swelling in the legs can also occur as a result of heart, liver, or kidney failure. These conditions disrupt the body’s fluid balance, leading to fluid buildup in different parts of the body.
  • Medication Side Effects: Some medications can cause leg swelling as a side effect. Examples include hormone replacement therapy, antidepressants, and anti-inflammatory drugs.

DVT-Related Swelling in Left Leg

Deep vein thrombosis (DVT) is one of the most common causes of left leg swelling. It occurs when a blood clot forms inside a deep vein in the leg, causing the vein to become inflamed. If left untreated, DVT can lead to serious complications, such as pulmonary embolism, which can be life-threatening. Some of the symptoms of DVT include:

  • Swelling: This is one of the most noticeable symptoms of DVT. The swelling is usually severe and occurs in one leg.
  • Pain: DVT can cause severe pain in the affected leg. The pain may also be accompanied by redness, warmth, and tenderness in the affected leg.
  • Difficulty Walking: DVT can also make it difficult to walk or stand for extended periods.
  • Shortness of Breath: In severe cases, DVT can cause shortness of breath, chest pain, and coughing that produces blood.

DVT Treatment Options

Treatment for DVT aims to prevent blood clots from getting larger and stop new clots from forming. The following treatment options are available:

  • Blood Thinners: These are medications that help prevent blood clots from forming. They work by reducing the blood’s ability to clot, which lowers the risk of developing new clots.
  • Thrombolytic Therapy: This is a procedure that involves injecting medication directly into the clot to dissolve it. Thrombolytic therapy is usually reserved for severe cases of DVT or when other treatments are not effective.
  • Compression Stockings: These are specially designed stockings that apply pressure to the legs, reducing swelling and preventing blood clots from forming. Compression stockings are usually prescribed as part of DVT treatment, and they should be worn daily.

Treatment for Leg Swelling Related to Surgery or Injury

If the swelling in your left leg is caused by an injury or surgery, the following treatment options can help:

  • Icing: Apply ice to the affected area to reduce inflammation and pain. Wrap the ice in a towel and apply it to the affected leg for 20 minutes at a time, several times per day.
  • Elevation: Elevate the affected leg to reduce swelling. Place a pillow under your leg when sitting or lying down to keep it elevated above your heart.
  • Pain Relief Medication: Over-the-counter pain medication, such as ibuprofen, can help reduce pain and inflammation associated with swelling in the leg.
  • Physical Therapy: Physical therapy can help stretch and strengthen the leg muscles, reducing the risk of further injury and swelling.

Prevention of Leg Swelling

There are several measures that you can take to prevent leg swelling, including:

  • Exercise: Regular exercise can help improve blood circulation in the legs, reducing the risk of developing blood clots.
  • Healthy Diet: Eating a healthy diet that is low in salt and high in fiber can help reduce the risk of developing conditions that can cause leg swelling, such as high blood pressure.
  • Compression Stockings: Wearing compression stockings can help improve blood circulation and reduce the risk of developing blood clots in the legs.

Common Questions and Answers About Leg Swelling

  • Q: Can leg swelling be a sign of a blood clot?
    • A: Yes, leg swelling can be a sign of a blood clot, especially if it is accompanied by pain, warmth, and redness.
  • Q: When should I see a doctor about leg swelling?
    • A: You should see a doctor if you experience sudden, severe swelling in one leg, or if the swelling is accompanied by other symptoms such as pain, warmth, or redness.
  • Q: Can sitting for prolonged periods cause leg swelling?
    • A: Yes, sitting for prolonged periods can decrease blood flow to the legs, leading to fluid buildup and leg swelling.
  • Q: Are there any home remedies for treating leg swelling?
    • A: Yes, home remedies such as applying ice, elevating the affected leg, and wearing compression stockings can help reduce swelling in the legs.


  • Mayo Clinic. (2021). Leg swelling. Retrieved from https://www.mayoclinic.org/diseases-conditions/swollen-legs/symptoms-causes/syc-20364738
  • Thrombosis Canada. (2021). Symptoms of DVT. Retrieved from https://thrombosiscanada.ca/deep-vein-thrombosis/symptoms-of-dvt/
  • WebMD. (2021). How to Treat Leg Swelling. Retrieved from https://www.webmd.com/pain-management/swollen-legs-ankles-feet