Final answer:
Edema can occur in both extracellular and intracellular spaces, including the interstitial fluid and blood plasma. It can be caused by various medical conditions or factors such as drug use, pregnancy, injury, or allergic reactions.
Step-by-step explanation:
Edema can occur in both extracellular and intracellular spaces.
Extracellular fluid, which includes interstitial fluid and blood plasma, is the second largest volume of water in the body and can become swollen with excess fluid, leading to edema.
Intracellular fluid, which is the fluid inside cells, can also experience swelling due to certain medical conditions, drug use, pregnancy, injury, or allergic reactions.