The most common cause of facial swelling is chronic nephritis or nephrotic syndrome.

However, it's important to rule out staying up late and excessive drinking water the night before.

After excluding these factors, it's advisable to go to the hospital for urine and kidney function tests, as well as protein content in the 24-hour urine.

For those with early-stage kidney disease, they may experience eyelid swelling and congestion upon waking up, which usually subsides within a few hours of waking up.

Rheumatic autoimmune diseases can also cause facial swelling.