Edema is swelling due to a buildup of fluid in tissues. Pitting edema is when an indentation remains after pressing swollen skin. The effect may also be noticeable after removing a tight shoe or stocking.
Anyone can have pitting edema, but because some causes are more dangerous than others, it is often a good idea to consult a doctor.
In this article, we describe who is at risk for pitting edema. We also explore accompanying symptoms, treatments, and prevention techniques.
Pitting edema is most common in the lower body, particularly in the legs, ankles, and feet.
Swelling due to edema will usually make the skin feel tight, heavy, or sore. Other symptoms depend on the cause, but they can include:
- tingling or burning sensations around the swelling
- pain and aching in the swollen areas
- skin that feels puffy or stiff
- skin that is warm or hot to the touch
- water retention
- unexplained coughing
- fatigue or decreased daily energy
- chest pain
- shortness of breath and difficulty breathing
People who experience chest pain, shortness of breath, or swelling in only one limb should seek immediate medical attention.
Pitting vs. non-pitting edema
Edema occurs when fluid that accumulates in tissues leads to swelling. When pressure
In non-pitting edema, the skin will return to its swollen shape once the pressure has been removed.
A variety of factors can lead to pitting edema, including:
- standing or sitting in one position for too long
- poor circulation
- trauma or injuries
- eating too much salty food
- certain medications, such as:
- blood pressure medications
- insect sting or bite
- blood clot
Alternatively, any of the following conditions may be responsible:
Pitting edema can affect anyone, though certain factors can increase a person’s risk.
In most cases, a doctor should determine the cause of pitting edema and, if necessary, refer a person to a specialist.
Some accompanying symptoms require urgent care. Anyone experiencing shortness of breath, difficulty breathing, chest pain, or swelling in a single limb should seek immediate medical attention.
When leg pain and swelling persist after a person has been sitting for several hours, this may indicate deep vein thrombosis. This occurs when a blood clot develops deep in the leg. Anyone who suspects this should seek urgent medical care.
Pitting edema during pregnancy
Pregnancy can cause pitting edema, and it usually resolves as the pregnancy ends.
However, it is a good idea to discuss every new symptom with a doctor, who can test to rule out serious conditions linked with edema, such as very high blood pressure or preeclampsia.
Healthcare professionals typically diagnose pitting edema with a physical exam. They may apply pressure to the swollen skin for a few seconds to check for lasting indentation.
Because some associated conditions are more dangerous than others, it is important to find the underlying cause of the edema. This may require thorough testing. The edema will usually resolve once the cause has been treated.
To properly identify the underlying cause, a healthcare professional may take a detailed medical history and ask about medications. They may then refer the person to a doctor who specializes in issues concerning the veins or circulatory system.
Tests that can aid in a diagnosis of pitting edema include:
- imaging tests, such as:
- chest X-rays, to show enlarged heart or fluid in the lungs
- echocardiogram, if involvement of the heart is suspected
- ultrasound of the leg, if a blood clot is suspected
- blood tests
- urine tests
- an echocardiogram, which is an ultrasound scan of the heart
Pitting edema is classified based on the depth and duration of the indentation. The following scale helps healthcare professionals to rate the severity:
Grade 1: The pressure applied by the doctor leaves an indentation of 0–2 millimeters (mm) that rebounds immediately.
Grade 2: The pressure leaves an indentation of 3–4 mm that rebounds in fewer than 15 seconds.
Grade 3: The pressure leaves an indentation of 5–6 mm that takes up to 60 seconds to rebound.
Grade 4: The pressure leaves an indentation of 8 mm or deeper. It takes 2-3 minutes to rebound.
Understanding the severity of edema can help a healthcare professional to identify the best course of treatment.
Treatment for pitting edema involves addressing the underlying cause of the edema. A range of treatments correspond with the range of causes, but some treatment methods include:
- elevating the swollen limbs above the level of the heart
- wearing compression stockings to encourage circulation.
- undergoing vascular surgery
- increasing blood protein levels
- taking diuretics to flush out excess fluid
When the underlying cause has been successfully treated, edema is unlikely to recur.
Some adjustments to lifestyle and diet can reduce the likelihood of developing edema, particularly if a person has a high risk.
These changes may include staying active, avoiding sitting or standing for long periods, and doing gentle exercises to reduce swelling.
Pitting edema is a common symptom. It is usually not a cause for concern in itself, but many underlying conditions require treatment, sometimes urgently.
Edema should not cause any long-term complications. After working with a healthcare professional, many people find lasting relief from the symptoms.