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“A Physical Therapist Found The Reason Sitting Suddenly Hurts After Weight Loss, And Why Most Doctors Never Mention It.”

You've probably been told it's just "your body adjusting." That's true, but it's not the whole story, and the missing part explains why it's not going away on its own.

June 18, 2026 | 9:15 am EST | Viewed by 266,128

Written by Sarah Mitchell, DPT- Doctor of Physical Therapy

 

 

Dear friend,

If you've lost weight recently and started noticing sitting hurts in a way it never did before. If you find yourself shifting your weight every few minutes at your own desk without realizing you're doing it.

 

 

 If you've already mentioned it to a doctor and gotten some version of "you've lost padding, your body's adjusting."

 

 

What I'm about to share is going to make you angry. Not because there's no fix. Because this has a straightforward mechanical explanation that takes about ninety seconds to understand, and it's rarely the conversation that happens at a weight-loss follow-up appointment.

Fourteen years treating other people, then it showed up at home

I've worked as a physical therapist for fourteen years, mostly with patients recovering mobility and managing chronic pain. 

 

 

I thought I understood pressure and posture. Then my own mother lost weight after a long health scare, and started quietly avoiding sitting at her own kitchen table.

 

 

She'd lost close to sixty pounds over about a year, a genuine win by every medical measure her doctor tracked. 

 

 

But I started noticing she was eating standing at the counter more often, taking the aisle seat wherever we went, turning down invitations that involved sitting for more than an hour. 

 

 

She never explained why. I finally asked directly, and she admitted her tailbone area had started aching within minutes of sitting on anything firm.

Missing it in my own family

I had failed to see it, professionally, in my own family. 

 

Fourteen years of treating pressure-related pain in other people's bodies, and I'd missed it happening in my own mother's, because nobody had told either of us to expect it as a direct consequence of the weight loss itself.

What we tried first, and why none of it held up

We tried the obvious things first. A standard foam cushion from a pharmacy, about fifty dollars, helped for the first week before it compressed flat under her daily use and stopped doing anything. 

 

 

A thicker foam wedge after that, forty dollars, this one lifted her nearly three inches off her kitchen chair, which threw off her whole posture at the table. 

 

 

A basic gel pad, sixty dollars, felt fine in the store, but she could feel the exact edge of it digging into the backs of her thighs within twenty minutes of sitting.

The conversation the weight-loss industry skips

Here's the part that took me longest to piece together professionally: there's very little incentive in a weight-loss industry built around before-and-after photos to mention what happens to the two bones you actually sit on once the padding around them is gone.

 

 

So I started researching on my own time, pulling papers on post-weight-loss pressure distribution, eventually spending up to $10,000 into materials and product testing just to understand what was actually happening structurally.

A quick self-check

Here's something you can check right now. Sit on a hard chair for two full minutes without shifting.

 

 

 If you feel a sharp, specific ache directly under your sit bones rather than a general soreness across your lower back, that's not your imagination and it's not unrelated to the weight loss.

The carpet-versus-hardwood explanation

The simplest way to picture it: think of your sit bones like the legs of a chair standing on soft carpet versus hardwood. 

 

On carpet, the legs sink in and the weight spreads out. 

 

 

On hardwood, all the weight concentrates on four small points. Padding around your sit bones used to work like that carpet, spreading your weight out before it reached bone. 

 

 

Once that padding is gone, your weight has nowhere left to go but straight down onto two small points, and that specific, sharp ache is your body's way of protecting an area no longer cushioned the way it used to be.

Deepseat Cushion

Redistributes weight off sit bones specifically

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Ergonomic Design

Holds shape over months of daily sitting

No edge pressure on thighs

Other Cushion

Redistributes weight off sit bones specifically

No added height at your desk

Ergonomic Design

Holds shape over months of daily sitting

No edge pressure on thighs

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Built for her, first

I built the first version for my mother directly, using a honeycomb gel structure instead of solid foam or gel, thousands of small connected cells that spread weight sideways across a wide surface instead of concentrating it straight down onto two points.

 

 

Six weeks in, she sat through an entire Thanksgiving dinner at her own table, over two hours, without once getting up to stand at the counter. My aunt actually asked if she was feeling alright, since she's normally up and down through every meal. She just said she felt fine.

It spread through her own circles first

Word spread through her walking group within a couple months. 

 

 

Then a woman from her weight-loss support group asked about it. Then that group's coordinator asked if she could recommend it to the rest of the group directly. 

 

 

What started as one cushion built for my own mother is now something over 5000+ people in that network alone have switched to.

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Deepseat is the name we landed on for the version we eventually brought to market. In the first sit, the cells begin adjusting around your specific pressure points.

 

 

 By the end of the first one to two weeks of regular daily use, most people notice they've stopped shifting position every few minutes without consciously trying to stop.

The numbers so far

over 90% of users report noticeably less sit-bone discomfort within the first month. Over 5000+ cushions sold. Refund rate under 1%.

Questions you're probably asking right now

"I've tried a gel cushion before and it didn't help." Basic gel pads without a true honeycomb structure still compress under sustained sitting, they just do it with a different material than foam. The connected-cell structure, not the gel itself, is what actually redistributes weight.

 

 

"Is it too late if I lost the weight a while ago?" No. The mechanism is about current padding levels, not how recently the weight came off. This applies whether it happened six months ago or six years ago.

 

 

"Will this make me sit too high at my desk?" No, this is specifically why the honeycomb structure matters, it redistributes weight without needing added bulk or height the way foam wedges do.

 

 

"Why didn't my doctor mention this?" Most weight-loss follow-up appointments focus on the metrics being tracked, blood pressure, A1C, weight itself, not necessarily every downstream physical change, including this one.

What this actually costs versus the alternative 

A single ergonomic office chair upgrade marketed for this kind of issue can run $150-$500. Deepseat costs a fraction of that and works with the chair you already have.

 

If you've been burned before

If you've been burned before by a cushion that promised relief and didn't deliver, that skepticism is fair. Deepseat comes with a 30-day trial and a full refund if it doesn't work for you, backed by a refund rate under 1%.

 

The honest part

Here's the honest part most pages like this skip: this isn't instant. Most people notice a real difference within the first one to two weeks, not the first sit, as the material adjusts to your specific new pressure points.

 

 

Two paths from here....

 

 

You have two paths from here. Keep standing at the counter and taking the aisle seat, hoping it eventually stops on its own. Or put something under you today that's built for exactly what happened to your body, not just a generic cushion that adds bulk in the wrong place.

What happens when you order

  1. Order ships within 7-15 business days
  2. Arrives ready to use on any chair you already own
  3. Use it normally for the first week
  4. Notice the difference by the end of week one to two
  5. Full refund available any time in the first 30 days if it's not right for you

P.S. My mother hosts Thanksgiving again every year now, standing at the counter only when she wants to, not because she has to.

 

 

P.P.S. This applies to anyone who's lost padding for any reason, illness, age, activity level, not only intentional weight loss. The mechanism is the same either way.

 

 

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The information on this page is not intended as medical advice and is not a substitute for professional treatment or diagnosis. The Deepseat Tool is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary. Testimonials are from real customers; results are not guaranteed.  The story depicted on this website is illustrative. Results portrayed are illustrative and may not be typical.

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