This type of swelling may be accompanied by:
- Shortness of breath
- Fatigue
- Rapid heartbeat
- Chest discomfort
Persistent swelling linked to breathing difficulties should be evaluated immediately.
5. Kidney or Liver Disease
The kidneys and liver help regulate fluid balance in the body. When these organs are not functioning properly, fluid retention may occur.
People with kidney or liver issues may also notice:
- Puffy eyes
- Abdominal swelling
- Fatigue
- Changes in urination
6. Blood Clots
Sudden swelling in one leg — especially when combined with redness, warmth, or pain — may signal a dangerous blood clot known as deep vein thrombosis (DVT).
This condition can become life-threatening if the clot travels to the lungs.
Seek urgent medical attention if swelling appears suddenly in only one leg.