Interstitial oedema is a medical condition characterized by an abnormal accumulation of fluid in the interstitial spaces of the body. It is caused by a variety of conditions and underlying medical problems, including heart or kidney failure, burns, and trauma, as well as medications and other substances. The most common symptom of interstitial oedema is swelling of the affected area, which may be accompanied by pain, redness, warmth, and tenderness. Other symptoms may include shortness of breath, increased heart rate, and fatigue. Diagnosis of interstitial oedema is based upon a physical examination and laboratory tests. Blood tests may be used to measure levels of electrolytes and proteins, as well as to assess kidney, heart, and liver function. Imaging tests, such as an X-ray or CT scan, may be used to identify abnormal accumulations of fluid in the tissues. Treatment of interstitial oedema depends on the underlying cause. In many cases, treatment may involve the use of medications to reduce fluid accumulation, such as diuretics. Other treatments may include lifestyle modifications, such as increasing physical activity, reducing sodium intake, and limiting alcohol consumption. In severe cases, surgery may be necessary to remove excess fluid.