Why Does Pain Feel Worse at Night? Bone, Inflammation and Sleep

Have you ever noticed that an injury or painful joint seems relatively manageable during the day, only to become more uncomfortable when you get into bed?

Perhaps your shoulder aches when you lie on it. Your lower back becomes uncomfortable after you’ve been resting for a while. Or an injured leg begins to throb despite doing very little.

Experiencing pain at night can be frustrating, particularly when it interrupts sleep or seems difficult to explain.

It can also raise an understandable question:

Does pain that becomes worse at night mean something serious is wrong?

Not necessarily.

Night pain occurs in many common musculoskeletal conditions. But the pattern of pain, how it developed and any accompanying symptoms can sometimes indicate a need for further investigation.

At RHP Physiotherapy in Kelvin Grove, Brisbane, our physiotherapists consider night pain alongside movement, physical activity, health history, sleep and other factors when assessing a painful condition.

One particularly interesting example involves bone stress injuries and the relationship between our internal body clock, bone metabolism and pain.

Why Does Pain Sometimes Get Worse at Night?

There is no single explanation for why pain may feel worse in the evening or during the night.

Several different factors can contribute, sometimes at the same time.

1. Less Distraction and a Change in Attention

During the day, our attention is distributed across many activities.

We work, move, talk, solve problems and respond to what is happening around us.

When we lie down in a quiet room, those competing demands are reduced.

Our attention may become more focused on sensations that were already present but less noticeable.

This does not mean the pain is imaginary or that the injured tissue has suddenly become more damaged.

Pain is a complex experience influenced by sensory information, attention, expectations, previous experience and the context in which it occurs.

For some people, the reduced distraction of nighttime may make existing discomfort more noticeable.

2. Sleeping Position and Sustained Pressure

Another common explanation is much more straightforward.

Spending several hours in one position can place sustained pressure or load on an already sensitive area.

For example:

• Someone with lateral hip pain may struggle to lie on the affected side.
• A painful shoulder may become uncomfortable when compressed against the mattress.
• Some people with lower back pain find prolonged lying or particular sleeping positions uncomfortable.
• People with an irritable knee may find that extended periods in one position increase discomfort or stiffness.

In these cases, pain at night may be related to positioning, pressure or the current sensitivity of the tissues.

Our Shoulder Physiotherapy, Hip & Groin Physiotherapy and Lower Back Pain services commonly consider how symptoms change across different positions and daily activities.

3. Sleep and Pain Influence Each Other

Sleep is not simply a passive period where the body switches off.

Sleep quality influences many processes involved in health, recovery and the experience of pain.

Research has found a relationship between poor sleep and musculoskeletal pain.

A 2024 systematic review involving more than 116,000 participants found that existing sleep problems were associated with a greater likelihood of developing chronic musculoskeletal pain.

Pain can also disrupt sleep, although the direction and strength of these relationships vary between studies.

This can create a difficult cycle:

Pain interrupts sleep → poor sleep may increase pain sensitivity → the following night’s sleep becomes more difficult.

These relationships are not identical for everyone, and not every person experiencing poor sleep will develop persistent pain.

But they help explain why improving sleep can sometimes be an important part of managing a painful musculoskeletal condition.

For people experiencing ongoing or recurring symptoms, our Chronic Pain Physiotherapy service considers these wider influences alongside physical assessment and activity goals.

Can Inflammation Cause Pain at Night?

Inflammation can contribute to pain, but it is important not to treat all inflammation as harmful.

Inflammatory activity is part of the body’s normal biological response to injury, tissue repair and other processes.

In an injured or irritated tissue, inflammatory mediators may influence the sensitivity of local nerve endings.

That can contribute to tenderness, pain or discomfort during movement and rest.

However, inflammation is not the only explanation for night pain, and the intensity of pain does not provide a direct measurement of how much inflammation is present.

To understand why nighttime is interesting, we also need to consider our circadian rhythm.

What Does Our Circadian Rhythm Have to Do With Pain?

Our circadian rhythm is the collection of roughly 24-hour biological rhythms that influence many functions throughout the body.

These include:

• Sleep and wakefulness.
• Hormone secretion.
• Body temperature.
• Immune system activity.
• Metabolic processes.
• Some aspects of pain processing.

The body’s internal clock helps coordinate these systems across the day and night.

Some inflammatory conditions also demonstrate patterns of symptoms that change throughout the day.

For example, inflammatory arthritis can be associated with pronounced morning stiffness or pain during the latter part of the night.

But our circadian rhythm does not provide one universal explanation for all pain that occurs at night.

Different tissues, health conditions and individuals can respond differently.

An Interesting Example: Bone Metabolism Changes Across the Day

This is where the science becomes particularly interesting.

Bone is not a static material.

It is living tissue that continuously responds to mechanical loading, hormones, nutrition and the wider physiological environment.

Cells called osteoclasts contribute to the breakdown and resorption of bone, while osteoblasts contribute to forming new bone.

These processes help maintain skeletal health and adapt bone to the physical demands placed upon it.

Importantly, some measurable aspects of bone metabolism follow a daily rhythm.

Does Bone Remodelling Increase at Night?

A 2023 systematic review of 29 studies investigated circadian patterns in blood markers associated with bone turnover.

The researchers found clear daily variation in several markers, including CTX, a marker of bone resorption, and osteocalcin, a marker associated with bone formation and turnover.

These markers commonly showed peaks during the night or early morning.

However, the patterns were influenced by other factors, including food intake, hormones and physical activity.

What does this tell us?

Bone metabolism is influenced by biological rhythms, including our circadian clock.

But there is a very important distinction between two statements:

• Bone turnover markers fluctuate across the day and night. This is supported by research.
• Increased bone remodelling at night directly causes nighttime bone pain. This has not been established.

The second statement is an interesting hypothesis, but we cannot assume that a blood marker reaching its daily peak means an injured bone must become more painful.

The mechanisms are likely more complicated.

Bone Stress Injuries: When Pain Begins to Occur at Rest or at Night

One musculoskeletal condition where nighttime pain becomes particularly relevant is a bone stress injury.

Bone stress injuries can occur when repeated mechanical loading exceeds the bone’s capacity to adapt and repair accumulated microscopic damage.

They are particularly relevant in activities involving repeated impact, including:

• Running.
• Football.
• Netball.
• Dance.
• Other sports involving repeated jumping or high-volume loading.

At RHP, our Running Physiotherapy, Netball Physiotherapy and Performing Arts Physiotherapy services work with athletes whose training demands may place them at risk of developing bone stress injuries.

What Is the Difference Between a Stress Reaction and Stress Fracture?

Bone stress injuries are often described as a continuum.

A stress reaction generally refers to an earlier form of bone stress injury, where the bone shows evidence of an abnormal response to repeated loading without an established fracture line.

A stress fracture refers to more advanced structural injury where a fracture may have developed.

The terminology is not perfectly consistent across studies or imaging classifications.

However, the important clinical point is that continued excessive loading can allow a bone stress injury to progress.

A 2025 international consensus statement emphasised that bone stress injuries require individualised assessment of injury severity, location, loading history and underlying risk factors.

What Does a Bone Stress Injury Feel Like?

In the earlier stages, an athlete may notice:

• Localised discomfort during running or impact activity.
• Pain that begins predictably after a certain amount of exercise.
• Tenderness over a particular area of bone.
• Symptoms that initially settle with rest.

As the injury becomes more severe, symptoms may begin earlier during exercise or persist afterwards.

Some people then develop pain during walking, normal daily activity or even while resting in bed at night.

This change is important.

Increasingly persistent, localised bone pain, particularly when it begins occurring at rest or at night, should prompt assessment rather than further increases in training load.

Not every person with a bone stress injury experiences night pain. Likewise, night pain does not automatically mean someone has a stress fracture.

Why Do Bone Stress Injuries Develop?

Bone stress injury is not simply the result of exercising too much.

It develops through an interaction of bone loading, recovery and individual capacity.

Relevant factors may include:

• A rapid increase in running or jumping volume.
• Changes in training intensity or frequency.
• Insufficient time to adapt to new loading demands.
• Low energy availability or inadequate nutrition.
• Previous bone stress injury.
• Bone health and hormonal factors.
• Other individual medical and physical characteristics.

For some athletes, the training load itself may not appear particularly unusual.

Instead, their capacity to respond to that load may have changed.

This is one reason assessment needs to look beyond the painful bone and consider the person’s broader health and sporting circumstances.

How Is a Bone Stress Injury Diagnosed?

A clinician will consider the history of symptoms, location of pain, training changes and clinical examination findings.

Imaging may be required to confirm the diagnosis or assess its severity.

Early bone stress injuries are not always visible on X-ray. MRI is commonly used when suspicion remains because it can identify changes before a clear fracture appears on standard radiographs.

Some bone stress injuries, particularly those involving higher-risk anatomical sites such as the femoral neck, require prompt medical assessment and appropriate protection from loading.

If you suspect a bone stress injury, avoid continuing painful running or jumping until you have been appropriately assessed.

Are There Other Bone Conditions That Cause Pain at Night?

Yes.

Although many instances of night pain occur in common musculoskeletal conditions, some less common bone disorders can also produce characteristic nighttime symptoms.

One example is an osteoid osteoma.

An osteoid osteoma is a benign bone tumour that can cause persistent, localised pain, often worse at night.

Its pain is classically responsive to anti-inflammatory medication, although this response is not sufficient to diagnose the condition.

This is a different condition from a bone stress injury.

Osteoid osteomas are uncommon, and most people experiencing night pain do not have a bone tumour.

However, persistent unexplained focal bone pain, particularly in children or younger adults, deserves appropriate medical assessment.

This example is a useful reminder that the pattern of pain can provide clinical clues, but cannot establish a diagnosis on its own.

Is Pain at Night a Red Flag?

Night pain has traditionally appeared on lists of warning symptoms, particularly when assessing conditions such as persistent lower back pain.

But we need to interpret it carefully.

Research examining clinical red flags has shown that many individual symptoms have limited diagnostic accuracy when considered in isolation.

Simply experiencing pain at night does not establish that a person has cancer, infection or another serious disease.

At the same time, it would be inappropriate to dismiss night pain without understanding the circumstances.

The important questions include:

• Is the pain new, persistent or progressively worsening?
• Does changing position make a difference?
• Is it related to an identifiable injury or increase in physical activity?
• Is the pain localised to a particular bone?
• Does it occur during the day as well as at night?
• Are there associated symptoms or relevant medical conditions?

What Can You Do if Pain Is Disrupting Your Sleep?

The most useful strategy depends on why the pain is occurring.

For example, someone with position-related shoulder discomfort may benefit from modifying how the arm is supported during sleep.

Someone with an irritable joint may need adjustments to the activities and loads they are currently performing.

Someone with a suspected bone stress injury may need a more substantial reduction in impact loading and further medical investigation.

Some practical considerations include:

• Consider positioning: Find sleeping positions that reduce sustained pressure on a sensitive area.
• Review recent activity: Think about whether symptoms followed a change in training, work or physical activity.
• Maintain comfortable movement where appropriate: Complete inactivity is not necessarily required for common musculoskeletal pain, although suspected fractures and bone stress injuries may require protection.
• Protect sleep routines: Maintain a regular sleep schedule and consider factors that interfere with sleep quality.
• Seek an appropriate diagnosis: Persistent, worsening or unexplained symptoms deserve assessment rather than repeatedly attempting to manage them with position changes alone.

There is no single sleeping position, exercise or treatment that resolves all nighttime pain.

Understanding the underlying presentation is the important starting point.

Frequently Asked Questions About Pain at Night

Pain Assessment and Physiotherapy in Kelvin Grove, Brisbane

At RHP Physiotherapy, we recognise that pain is influenced by more than a single tissue or movement.

Understanding a painful presentation involves considering the person’s symptoms, relevant medical history, physical examination, sleep, activity demands and broader circumstances.

Depending on the presentation, our services include:

• Physiotherapy for assessment and management of musculoskeletal pain.
• Sports Physiotherapy for sport-related pain, overuse injuries and physical preparation.
• Running Physiotherapy for runners managing impact-related symptoms or returning from injury.
• Chronic Pain Physiotherapy for people experiencing persistent or recurring pain.
• Lower Back Pain Physiotherapy for assessment of back symptoms and associated functional limitations.

When symptoms suggest a medical condition requiring further investigation, appropriate referral to a GP or specialist forms part of good clinical care.

The important message is that pain at night should not automatically be considered dangerous, but it should not automatically be dismissed either.

Understanding the pattern of symptoms and the person experiencing them is much more useful than relying on one characteristic of pain in isolation.

Author in the know

Sam Donaldson

Director, APA titled Sports and Exercise Physiotherapist. Sam loves to treat athletes with lower limb injuries and has a special interest in knees of all ages; adolescent knee pain, athlete with knee pain, ACL injuries, ACL rehabilitation, Knee Osteoarthritis and Knee Replacement recovery. He is a Dad, Football enthusiast and loves to move. BAppSci (HMS), MPhtyStudies, MPHTY (Sports)