Collagen and joints: why do they hurt and what can we influence?

Bones, cartilage, the joint capsule, ligaments, muscles, tendons and the nervous system all work together during movement. The location of pain alone does not identify its cause.

• Cartilage and joint surfaces: allow bones to move against one another.
• Joint capsule and ligaments: help guide and stabilise the joint.
• Muscles and tendons: generate and transmit force.
• Nervous system: coordinates movement and contributes to pain perception.

An assessment may also consider walking, range of motion and surrounding muscle function. Pain location alone is not sufficient for self-diagnosis.

Osteoarthritis affects the entire joint. Changes may involve cartilage, bone and surrounding tissues. Risk factors include age, previous injuries, excess body weight and some forms of repeated loading.

Pain during activity and brief stiffness after resting are common, but similar symptoms may have other causes. An accurate diagnosis requires a professional assessment.

Prolonged inactivity can reduce muscle strength and fitness. Strong, well-coordinated muscles help stabilise joints and support daily tasks.

• Mobility: work within a range of motion appropriate to your current condition.
• Strength: increase muscle-strengthening exercises gradually.
• Fitness: consider walking, cycling or water-based activity according to your abilities.

If symptoms persist, a physiotherapist can help plan exercises and loading. After an injury or surgery, follow your treating team’s instructions first.

When returning to movement, note symptoms during exercise, later that evening and the following day. Mild discomfort during a planned rehabilitation programme does not necessarily mean tissue damage. Sharp or increasing pain, or new swelling, is a reason to stop and seek assessment.

If significant worsening persists, do not increase intensity and consult a healthcare professional. There is no universal pain threshold that is safe for everyone.

For people with excess weight, gradual weight management may reduce the load on weight-bearing joints. Preserving muscle mass and adequate nutrient intake is important.

• Balanced diet: sufficient energy and protein.
• Appropriate activity: alternate movement with rest breaks.
• Recovery: maintain regular sleep and rest.

Dietary supplements do not replace assessment of the cause of pain or an individual movement plan.

1. Describe the problem: where and when does it hurt, and was there an injury?
2. Set a specific goal: for example, getting up from a chair or climbing stairs more comfortably.
3. Choose a manageable starting point: with professional guidance if pain is unexplained.
4. Record your response: during activity and afterwards.
5. Track everyday function: adjust your plan as your abilities change.

Focus on your own progress rather than comparing your pace with others.

Urgent medical attention: a hot, swollen joint, particularly with fever, chills or feeling generally unwell, needs assessment the same day. After an injury, seek emergency help for deformity, severe pain, loss of sensation or inability to bear weight.

Arrange an appointment: if pain affects sleep or daily life, worsens, recurs, does not improve after about two weeks, or morning stiffness lasts more than 30 minutes.

A randomised, double-blind, placebo-controlled trial, study 01998 (NCT05369780), investigated 10 g of a specific hydrolysed collagen peptide daily for eight weeks in 160 adults with osteoarthritis affecting multiple joints; 159 completed the trial.

Findings from one ingredient and study population cannot automatically be generalised to every collagen supplement. Collagen does not replace diagnosis or treatment of osteoarthritis.

Does knee pain always mean osteoarthritis? No. There are several possible causes, which require individual assessment.

Should I stop moving altogether if a joint hurts? It depends on the cause. For chronic symptoms, the aim is often to find a tolerable level of activity; an injury or new swelling should be assessed first.

How can I tell if I increased the load too quickly? Significant and persistent worsening is a signal to adjust the programme.

What should I bring to an appointment? Note when symptoms began, any injuries, movements that aggravate the pain, duration of stiffness, swelling and a list of medicines and supplements.

• NIAMS: Osteoarthritis — https://www.niams.nih.gov/health-topics/osteoarthritis
• NIAMS: Diagnosis, Treatment, and Steps to Take — https://www.niams.nih.gov/health-topics/osteoarthritis/diagnosis-treatment-and-steps-to-take
• NHS: Joint pain — https://www.nhs.uk/symptoms/joint-pain/
• Swedish Nutra AB: Joint Collagen – Clinical Study Summary, SN-JC-2025 v2.1 (2026); trial 01998 / NCT05369780.
• Published randomised controlled trial: Journal of Clinical Medicine (2025), 14(11), 3655.

Educational material only. It does not replace an individual medical assessment, diagnosis or treatment.