5 Signs Your Mattress Is Too Soft (and Might Be Causing Back Pain)

Updated November 2026 by Christian

Sinking into bed after a long day feels great. Sinking too far does not. If you wake up stiff, toss around all night, or feel like you're climbing out of a hole each morning, your mattress may be too soft for you.

The short answer: a mattress is probably too soft if your hips sink well below your shoulders, you wake up with a sore lower back that eases during the day, or you feel stuck in the bed. Everyone needs enough support to keep the spine in a neutral line, and soft beds also lose support as they age.

Nothing is wrong with loving a plush feel. The right firmness depends on your body type, your sleep position, and what you need from your bed. Here are five signs the balance has tipped.

The 5 signs at a glance

Sign 1: You wake up with a stiff, sore lower back

This is the most common symptom of a bed that's too soft. When your hips sink deeper than the rest of your body, your spine curves out of its natural alignment and the muscles around it work all night instead of resting. You notice it first thing in the morning, after hours in the same position.

Lots of things cause a sore back, so look at the pattern. If the ache shows up on waking and fades within an hour or so of moving around, the mattress is a likely suspect. (More on other causes below.)

Sign 2: You can't get comfortable

Tossing and turning now and then is normal. Stress, anxiety, and health issues can all cause insomnia. But your mattress affects how quickly you settle. If you're constantly readjusting, your muscles may not be able to relax on a surface that lets your body sag.

Sign 3: You have neck or shoulder pain, especially as a stomach sleeper

Stomach sleepers (an estimated 16% of all sleepers) are the most sensitive to soft beds. The position already adds twisting strain to the neck, jaw, and upper back. On a mattress that's too soft, your hips drop and arch your lower back, which makes it worse.

If you're sure you have the right pillow for your sleep position and still wake up with neck and shoulder pain, sinking hips may be the cause.

Sign 4: You struggle to get in and out of bed

If you feel "stuck" and have to push yourself out of the mattress, it may be too soft. Memory foam is very conforming and can create that feeling for some sleepers. Feeling stuck on a hybrid, latex, or latex-alternative foam bed is a stronger hint that firmness is lacking, since those materials are more buoyant.

Looking for the firmest mattress ever? Check out the two-sided Plank mattress: firmer, flatter, flippable.

Sign 5: You feel like you're "bottoming out"

Quality mattresses have three or more layers: a comfort layer on top, a transition layer in the middle, and a support layer at the base. The top layers contour to your curves. If you feel yourself sink all the way to the support layers, the mattress is too soft or worn out.

How to test if your mattress is too soft at home

These four checks take a few minutes and need no special equipment.

1. The hand test (back sleepers). Lie on your back in your normal position and slide your hand under your lower back. On a supportive mattress your hand should slide in with a little resistance. No room at all means your hips and lower back have sunk in and the bed is likely too soft. A big gap can mean it's too firm.
   
   

2. The alignment check (side sleepers). Ask a partner to photograph you from behind while you lie on your side. Your spine should run in a fairly straight line from neck to tailbone. If your hips dip noticeably below your shoulders and waist, the mattress isn't holding you up.
   
   

3. The straightedge test. Remove your bedding and lay a broom handle or long straight board across the mattress where you sleep. A visible gap between the board and the surface points to broken-down support layers. Check your warranty, since many cover body impressions past a certain depth.
   
   

4. The get-up test. Notice how much effort it takes to roll over or get out of bed. If you have to push or climb out of a dip, it's too soft for you.
   
   

If your mattress fails more than one test, especially alongside the signs above, look at a more supportive option.

Too soft or too firm? Check before you buy

Morning stiffness can come from either end of the firmness scale, so don't assume firmer is always the answer.

Extra firm is not automatically better. The goal is neutral spinal alignment with pressure relief at the shoulders and hips. Soft-to-medium mattresses cushion pressure points with contouring foam layers, and they don't have to feel like quicksand. Latex hybrids add buoyancy, and quick-response memory foam contours with a more on-top feel. Hybrids combine foam and coils for comfort and support together.

Other causes of morning stiffness to rule out

A mattress is only part of your sleep setup.

• Sleep position. Each position loads the body differently. Stomach sleeping tends to pull the spine out of alignment. Many sleep experts suggest trying to shift toward side sleeping, for example by propping your torso with a pillow. Side sleepers can also fall out of alignment with the wrong pillow. Try changing positions for a week or two and see whether morning soreness changes.
  
  

• Pillow loft. Side sleepers generally need a higher-loft, more supportive pillow. Stomach sleepers do better with a low-profile pillow. Back sleepers can use high or low loft depending on preference. Your pillow matters as much as your mattress for alignment, so see how to choose a pillow for your sleep position.
  
  

• Your foundation. See the fixes below.
  

What to do if your mattress is too soft

• Check its age. A mattress that's too soft and one that's simply too old are different problems. Mattresses soften over time, and a bed older than 7 to 8 years is probably due for replacement.
  
  

• Rotate it. Most modern mattresses aren't flippable, but nearly all need regular rotation to keep their shape. If you've had yours more than a year and never rotated it, turn it 180 degrees and see if the problem improves.
  
  

• Check your foundation. A good foundation gives critical center support. Use a box foundation, a flexible platform, a metal grid base, an adjustable power base, or a frame with slats no more than 8 inches apart. The wrong support can also affect your warranty. An adjustable base lets you raise the head and foot of the bed evenly, which some sleepers find more comfortable than propping up with pillows.
  
  

• Upgrade. If age isn't the issue, it may be time to reconsider the type of bed. Sleep preferences change over time, and many people want steadier lumbar support as they get older. When you shop for a replacement, weigh your sleep position, body type, and feel preferences, and choose a brand with a real trial. Brooklyn Bedding offers a 365-night trial so you can check comfort and support at home. Not sure what to pick? Chat with a Brooklyn Bedding sleep specialist.
  

When to talk to a healthcare professional

A mattress is not a treatment for back pain. If your pain is persistent, gets worse, or comes with numbness, weakness, or other symptoms, see a healthcare professional. If you suspect a sleep disorder, a new mattress won't make up for it, so talk to a doctor.

Frequently asked questions

How do I know if my mattress is too soft?

Common signs are waking with a stiff lower back, hips sinking below your shoulders, feeling stuck when you get up, and feeling the base layer when you lie down. The hand and straightedge tests above can confirm it.

Can a mattress that's too soft cause back pain?

It can contribute. When your hips sink too far, your spine can fall out of alignment and the surrounding muscles stay tense, which can lead to morning stiffness. Other factors such as sleep position, pillow, and your overall health also play a role.

Is a firmer mattress better for back pain?

Not automatically. Aim for neutral spinal alignment with pressure relief at the shoulders and hips. Too firm a bed can cause aches at pressure points.

How long does a mattress last before it gets too soft?

Mattresses soften over time, and a bed older than 7 to 8 years is probably due for replacement. Sooner if you see visible body impressions or sagging.

Can I fix a mattress that's too soft without buying a new one?

Sometimes. Rotate it, check that your foundation has proper center support, and confirm the bed isn't past its useful life. If it fails the straightedge test, replacement is likely.