Is Your Mattress Too Firm or Too Soft? How to Tell & What to Fix

If you wake up with aches, stiffness, or poor sleep and can’t work out why, your mattress comfort could be the reason. A mattress that’s too firm or too soft can affect spinal alignment, pressure points, and overall sleep quality - often without being obvious at first ⬇️

In this guide, we’ll help you recognise the signs your mattress isn’t right for your body, explain how firmness impacts sleep, and show you how to choose a mattress feel that supports better, more comfortable rest.

We also cover what to adjust first before replacing a mattress, including pillows, toppers, and your bed base, so you can make a smarter long-term decision.

This video is helpful if you’re:

  • Waking up with back pain, sore hips, or shoulder discomfort
  • Tossing and turning during the night
  • Feeling stiff in the morning even though your mattress feels “comfortable”
  • Unsure whether you need a firmer or softer mattress

Choosing the right mattress isn’t about guessing or copying someone else, it’s about understanding how your body is supported over the entire night.

👉 Learn more or talk it through in store or online

00:00 Too Firm vs Too Soft - Why They Feel Similar

00:09 Why Mattress Comfort Is Often Misdiagnosed 

00:28 Symptoms of a Too Firm Mattress

01:05 Symptoms of a Too Soft Mattress

01:36 How Sleeping Position Changes Mattress Feel

02:10 Simple Mattress Test You Can Do at Home

02:32 What to Adjust Before Replacing Your Mattress

03:10 The Most Common Mattress Mistake

03:17 Final Advice for Choosing the Right Mattress

#MattressAdvice #TooFirmOrTooSoft #BetterSleep #SleepTips #BackPainSleep #MattressBuyingGuide #SleepComfort


Related mattress buying guides

If this guide helped, watch the full Between the Sheets series for more mattress buying advice.

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FAQ - Is Your Mattress Too Firm or Too Soft?

What are the main signs that my mattress is too firm?

Common signs include waking up with shoulder pain, hip pressure, or stiffness in the upper back. You may also feel like you're sleeping "on top" of the mattress rather than sinking in slightly, and find it hard to change positions comfortably.

What are the signs that my mattress is too soft?

The biggest indicator is lower back pain or stiffness in the morning. You may notice your hips sinking too deeply, your spine curving out of alignment, or feeling like you're "hugging" the mattress. Side sleepers often wake up with hip and shoulder discomfort.

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

Yes. A mattress that's too firm creates pressure points on shoulders and hips, misaligning the spine. A mattress that's too soft allows the heavier parts of your body (hips and lower back) to sink, causing poor spinal alignment and lower back strain.

How can I test if my mattress is too firm or too soft?

Lie on your back and slide your hand under your lower back - there should be a small gap (about the thickness of your hand). On your side, your spine should stay relatively straight. If you feel pressure on shoulders/hips (too firm) or your hips sink too much (too soft), the mattress may not be right for you.

Does sleeping position affect whether a mattress feels too firm or too soft?

Absolutely. Side sleepers usually need a softer or medium mattress to cushion shoulders and hips. Back and stomach sleepers often prefer a firmer feel for better spinal support. If your sleeping position has changed, your old mattress may now feel wrong.

How long should a mattress last before it becomes too soft or too firm?

Most quality mattresses last 7–10 years. After 5–6 years, many start to soften or develop body impressions. If you're waking up with new aches and pains that weren't there before, it's often a sign your mattress has lost its support.

What should I do if my mattress is too firm?

Add a plush mattress topper (latex or memory foam) for extra cushioning, especially on the shoulders and hips. Alternatively, consider replacing it with a medium to medium-firm model suited to your body weight and sleeping position.

What should I do if my mattress is too soft?

A firmer mattress topper or a supportive underlay can help temporarily. For a long-term fix, switch to a medium-firm or firmer mattress with strong edge support and zoned coils or pocket springs.

Should I buy a new mattress or just use a topper?

A quality topper can extend the life of your current mattress by 1–3 years. However, if your mattress is over 7 years old, has visible sagging, or is causing consistent pain, it's usually better to invest in a new mattress for proper spinal health.

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