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August 8, 2026

When you move less, gain weight, and swelling piles on top

Dr. Nahyun Park
Medically reviewed by Dr. Nahyun Park Associate Director

What follows combines several people's visits into one reconstructed account. It is not any one person's story, and anything that could identify someone has been removed.

How do people describe it when they come in?

As they went out less and spent more time at home, they gained weight. It overlaps with a period when both their sleep times and mealtimes got thrown off.

On top of that, their legs swell. By evening their shoes feel tight and their calves feel heavy. Some find this harder than the weight itself.

Are swelling and weight gain different things?

They are. But they often come together. When circulation slows, fluid stays in the lower body, and because the body feels heavy you move less, so it builds up again.

So if you look only at the number on the scale, you can't tell what increased. You can't tell whether you've lost water or lost fat.

What do we look at?

We look at body composition first, checking separately how much body fat you have relative to muscle and how much fluid is sitting in the lower body.

There's a reason we do this test at the start: later, we need to see what changed against this baseline. It shows what the scale alone can't.

We also check whether only one leg swells. If one leg is unusually swollen, painful and red, it may be a different problem, and that needs to be checked first.

How do we treat it?

We start with the fluid that's staying put. We use herbal medicine to support circulation and help the stomach do its job, while working toward reviving the body's own energy.

At the same time, we make sure you don't lose muscle. If you cut back only by eating less, muscle goes too, and then it's easier to end up back where you started.

We set movement starting with things that aren't strenuous. If you start with intense exercise before the swelling goes down, you won't keep it up for long.

How did people do?

What changes first is the legs in the evening. Many first mention that their shoes feel less tight and their calves feel lighter.

We put body composition side by side with the first measurement. Rather than reading out numbers, looking at it together — "Last time it was like this, and this time it's like this" — makes much more sense to people.

What are the limits of this approach?

Swelling has other causes too, such as the kidneys, heart or thyroid. What we look at is just one of those paths.

If only one leg swells, you're short of breath, or it gets worse when you lie down, that care comes first. We don't promise to take off a certain amount by a certain time.

If you share the same concern

  1. Swelling and weight gain are different, but they often come together.
  2. The number on the scale alone can't tell you what increased.
  3. Measuring body composition at the start gives you a baseline to compare later.
  4. Cutting back only by eating less means losing muscle too.
  5. If only one leg swells or you're short of breath, that care comes first.

We don't look only at the number on the scale. Why the weight went up differs from person to person, so we start by finding that reason.

If you keep losing weight and gaining it back, come and see us. Before the number on the scale, we first look for why the weight went up. It's different for everyone.

Because there are many possible causes, progress differs from person to person, even with the same care.

Have symptoms on your mind?

We're open until 8:30 p.m. on weekdays, and on weekends and public holidays too.

We can help you in English

Message us in English through the messenger (chat) at the bottom right of the page. Our staff translate the replies, so it may take a little time to hear back.

Phone: +82-53-716-1175 (within Korea: 053-716-1175)

Dr. Nahyun Park

Dr. Nahyun Park Associate Director

I mainly see problems that start with body alignment and posture. I'm in charge of care that requires looking at the balance of the whole body, such as children's growth, weight loss and recovery after car accidents. I have published meta-analyses on fatigue in international journals. That research experience helps when I see patients whose fatigue doesn't go away no matter how much they rest.

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