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Is sudden weight gain and swelling indicative of lupus nephritis?

A MyLupusTeam Member asked a question 💭

I’ve been asking my rheumatologist why I keep gaining water weight suddenly, 10lbs in 2 days, then losing it over the next week or so. She doesn’t seem to know why. I feel like it must be lupus nephritis. So far I’ve only been diagnosed with SLE.
I woke up this morning and could barely open my eyes they were so swollen. I feel as swollen as a tick!
I had orders for lab work so I had it done this morning. Maybe the results will show something while I am actively having a flare?

August 29
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6 Classes of Lupus Nephritis: Diagnosis and Treatment Read Article...
A MyLupusTeam Member

What does your urine look like? And have your doctor ran a urine sample and protein/creatine?

I went from March 2026 to July 2026 before I finally convinced my old nephrologist to order a kidney biopsy. My UPCR was always giving normal numbers until recently. It's worth it to research and actually see even how your body behaves, what your own urine looks like and talk to your rheumatologist...

Hope you find out something soon!!

August 29
MyLupusTeam

Getting that lab work done during an active flare was a really smart move — timing can make a big difference in catching what's going on. Swollen eyes, sudden fluid gain, and then losing it over days are absolutely worth investigating seriously.

Sudden weight gain and swelling can indeed be signs of lupus nephritis, which Show Full Answer

Getting that lab work done during an active flare was a really smart move — timing can make a big difference in catching what's going on. Swollen eyes, sudden fluid gain, and then losing it over days are absolutely worth investigating seriously.

Sudden weight gain and swelling can indeed be signs of lupus nephritis, which develops in around 50% of people with SLE. When the kidneys become inflamed, they struggle to filter excess fluid properly, causing it to build up in the body — including around the eyes and face. Other symptoms to watch for alongside swelling include:

- Foamy or discolored urine (pink, red, or brown)
- Frequent urination, especially at night
- High blood pressure
- Fatigue

The pattern of rapid weight gain followed by gradual loss could reflect the kidneys struggling to manage fluid at certain times. This is worth pushing harder on with your rheumatologist, especially with fresh lab results in hand. It's also important to be aware that rapid weight gain can sometimes signal nephrotic syndrome, a serious kidney-related condition. Red-flag symptoms that need prompt medical attention include:

- Sudden significant weight gain
- Shortness of breath
- Very foamy or bloody urine
- Dramatically reduced urine output
- Nausea, vomiting, or abdominal pain

If any of these appear, don't wait — contact your doctor right away. Hopefully those lab results will give you and your rheumatologist some clearer answers very soon! 🤞

August 29

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