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Stop or change the movement that is causing pain; “low-impact” does not mean pain-free or suitable for every joint. If the discomfort is mild and settles, try less time, lower intensity, fewer sessions, or a different activity that causes no or little pain. Do not push through sharp, constant, worsening pain, a limp, major swelling, or a hot or red joint: those symptoms call for medical advice, and some need urgent assessment.
What to do during and just after a painful exercise session
- Stop the provoking movement. Pause rather than trying to finish the set, distance, or class through pain. Notice which movement brings it on and whether the discomfort settles after you stop.
- Let symptoms guide the next step. If pain is mild and settles, reduce the duration, frequency, or intensity next time. You can also try a different activity that puts less pressure on the affected joint. Choose a pace and movement that cause no or little pain.
- Use a short-term comfort measure if useful. For knee pain, NHS guidance says to limit weight-bearing at first and apply an ice pack—or a bag of frozen peas—wrapped in a tea towel for up to 20 minutes every 2 to 3 hours. Never put ice directly on skin. This is a comfort measure, not a way to identify or treat the underlying cause.
- Keep the joint gently moving as symptoms allow. For joint pain generally, NHS advice includes resting the affected joint if possible and using a wrapped cold pack for up to 20 minutes every 2 to 3 hours, while not stopping movement completely.
Seek professional advice rather than testing the joint with another workout if pain is sharp, stabbing, constant, or getting worse; if you are limping or changing how you walk; or if there is substantial swelling, heat, or redness. The urgent warning signs are listed below.
Why low-impact activity can still hurt
“Low-impact” describes activity that generally involves less jarring or joint pressure than higher-impact movement. It is a relative description, not a guarantee that an activity will be comfortable for a particular person. A movement can still irritate a painful joint, and the label alone does not explain why symptoms started.
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For example, cycling may be gentler than running for one person but still hurt if the resistance, duration, seat position, or knee bend aggravates symptoms. Water exercise reduces loading for many people, yet getting into a pool, kicking, or using a particular stroke may still be uncomfortable. Brisk walking is a CDC example of a joint-friendly option, but it should still be tested at a comfortable pace and shortened if symptoms appear. The useful test is your symptom response, not the activity’s marketing label.
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Knee or other joint pain after exercise does not, by itself, establish arthritis, an injury, or a structural problem. The NHS lists possible causes of joint pain that include a strain, osteoarthritis, bursitis, rheumatoid arthritis, gout, and joint infection. These conditions can have different signs and require different care; a single symptom description is not enough to identify the cause. Avoid self-diagnosing based only on which exercise triggered the pain.
Some general guidance offers a timeframe for adapting activity, but it is not a reason to endure persistent or worsening symptoms. CDC guidance on pain during or after exercise, archived and last reviewed November 15, 2021, says joints may need 6 to 8 weeks to adapt to a new activity level. That is a dated general estimate—not a universal clinical threshold, and not a reason to wait if warning signs appear.
How to adjust activity without giving up movement
Scale the session down
Reduce one or more of the factors that may be aggravating the joint: how long you exercise, how often you do it, or how intense the session is. Start slowly, warm up and cool down, and use a comfortable pace. CDC guidance emphasizes noticing how your body feels and increasing difficulty in small amounts. It also notes that even “just 5 minutes” is enough to begin activity and that short bouts add up.
There is no need to make a large jump in duration or effort to count a session as worthwhile. If a shorter or easier attempt still produces pain, stop that movement and consider a different option rather than repeatedly challenging the same symptom. A rest day or a switch to gentle movement can be a useful temporary adjustment, but prolonged complete inactivity can make it harder to resume normal movement.
Choose an alternative by how it feels, not by a universal ranking
CDC examples of activities that may be joint-friendly include cycling, swimming, brisk walking, and water exercise. They are options to consider, not a promise that each one will suit every person. Compare alternatives using practical questions:
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- Does the activity cause no or little pain during and after the session?
- Can you begin at a low level and increase gradually?
- Is it accessible and something you prefer enough to keep doing?
- Does it seem to put less pressure on the painful joint than the movement you are replacing?
CDC describes the best activities as ones that are fun, easy to get to, cause no or little pain, and are activities you will stick with over time. Access and preference matter because an activity that cannot be done consistently is unlikely to help. The American College of Rheumatology and Arthritis Foundation guideline likewise could not establish a hierarchy in which one exercise type is universally best.
For people with diagnosed knee osteoarthritis, the American Academy of Orthopaedic Surgeons describes swimming and cycling as lower-impact alternatives to jogging or tennis. Exercise can improve pain and function in knee osteoarthritis, but that advice is specific to an established diagnosis; it does not diagnose the cause of new knee pain or establish the best alternative for everyone.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The 2019 American College of Rheumatology/Arthritis Foundation guideline for hand, hip, and knee osteoarthritis recommends exercise but does not establish one form as best or rank exercise types. It emphasizes preference and access. The practical choice is therefore an activity that suits the person and their symptoms, with clinical input where needed—not a supposedly ideal exercise selected from a universal list.
Plan a cautious return
Once symptoms have settled, resume with a brief, easy session rather than returning immediately to the previous workload. Warm up, keep the pace comfortable, and increase difficulty in small amounts. If the same pain returns, record the activity, the specific movement, how severe the pain was, and how long it lasted. Those details can help a clinician or physical therapist individualize a plan. Do not use the 6-to-8-week adaptation estimate to justify continuing pain that is severe, persistent, or worsening.
When to get medical help
Get urgent assessment for serious symptoms
Seek urgent medical advice for a very painful or badly swollen knee, inability to move it or bear weight, a changed knee shape, locking or giving way, or feverish illness with a hot or red knee. A hot, swollen joint with fever or feeling generally unwell also needs urgent assessment. NHS guidance additionally identifies severe pain after a fall or injury, inability to walk, a joint that appears displaced, or numbness or tingling after an injury as reasons for urgent or emergency care.
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Contact routes depend on where you live. NHS guidance directs people in the UK to NHS 111 for urgent advice in relevant cases; NHS 111 is not a contact route for readers elsewhere. Use your local urgent-care or emergency service when symptoms warrant it.
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Arrange a non-emergency clinical review when symptoms persist
For knee pain, NHS guidance advises seeking help if it has not improved within a few weeks. For joint pain more generally, it advises seeing a GP if pain stops normal activities or affects sleep, is getting worse or keeps returning, has not improved after two weeks of home care, or comes with morning stiffness lasting more than 30 minutes.
CDC’s archived exercise-pain guidance, last reviewed November 15, 2021, also advises a doctor’s review for sharp, stabbing, or constant pain; limping; pain lasting more than two hours after exercise or worsening at night; symptoms that do not settle with rest or hot/cold packs; or a large increase in swelling or heat/redness. These are thresholds from dated published guidance, not a newly issued universal rule. In particular, do not wait for a time threshold if symptoms are severe or an urgent warning sign is present.
Medicines and individualized advice
Pain medicines are not one-size-fits-all. Ask a pharmacist or clinician which option, if any, is appropriate for you, taking your health history and other medicines into account. The AAOS notes that nonsteroidal anti-inflammatory drugs (NSAIDs) may need caution or avoidance for people with certain conditions, including coronary artery disease, heart failure, or chronic kidney disease. Do not treat a general exercise article as individualized medication advice.
If you have arthritis, are returning to activity after a long break, or are unsure how to modify movement, a clinician or physical therapist can help tailor a plan. CDC notes that people with arthritis may benefit from working with a physical therapist when starting activity. A physiotherapy or community musculoskeletal service may be useful for persistent or recurring symptoms, but the appropriate service depends on your location and diagnosis.
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If you have diagnosed osteoarthritis
For people with osteoarthritis, suitable exercise can be part of care and may improve pain and function, according to the AAOS. That does not mean every exercise is appropriate at every moment, or that new, severe, or unexplained pain should be ignored. The ACR/Arthritis Foundation guideline says there is “no uniformly accepted level of pain at which a patient should or should not exercise.” It recommends common-sense shared decision-making between the patient and treating clinician about when to begin an exercise program.
In practice, report the type of activity, what movement brings on symptoms, how severe they are, and how long they last. That gives a clinician useful context for adapting exercise. There is no single pain score or exercise type in these guidelines that can determine what is safe for every individual.
A simple way to decide what to do next
- Mild discomfort that settles: reduce session time, frequency, or intensity; choose a comfortable pace and reassess with a gentler activity.
- Pain that persists, recurs, worsens, or limits daily life: arrange a clinical review using the timeframes above.
- Severe pain, inability to move or bear weight, marked swelling or shape change, locking or giving way, or fever with a hot/red joint: seek urgent assessment rather than exercising or waiting it out.
These steps can help you respond safely, but they cannot determine the cause of an individual’s pain. NHS guidance advises against self-diagnosis, and a clinician can assess symptoms that are persistent, troubling, or urgent.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Frequently Asked Questions
Should I stop all exercise if my knee hurts?
Stop the movement that provokes pain. If discomfort is mild and settles, reduce the session’s time, frequency, or intensity, or switch to an activity that causes no or little pain. Do not stop moving the joint completely unless a clinician tells you to, and do not continue through sharp, constant, worsening pain or a limp.
Is swimming always safe for knee pain?
No. Swimming and water exercise are lower-pressure options for many people, and AAOS lists swimming as an alternative for diagnosed knee osteoarthritis. Test any activity at an easy level and stop if it causes pain; low impact is not a guarantee of suitability.
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How long should I use an ice pack?
For a painful knee, NHS guidance allows a wrapped ice pack or wrapped bag of frozen peas for up to 20 minutes every 2 to 3 hours. Keep a cloth barrier between the cold pack and skin. It is a comfort measure, not a diagnosis or cure.
When should exercise pain be checked by a clinician?
Arrange a review if pain stops normal activities or sleep, worsens or keeps returning, has not improved after two weeks of home care, or comes with morning stiffness lasting more than 30 minutes. CDC’s archived guidance also flags sharp, stabbing, constant pain, limping, pain lasting more than two hours after exercise, night-worsening pain, or increasing swelling, heat, or redness.
What knee symptoms need urgent help?
Seek urgent assessment for very severe pain, major swelling, inability to move or bear weight, a changed shape, locking or giving way, or feverish illness with a hot or red knee. Severe injury with inability to walk, displacement, or numbness or tingling also needs urgent or emergency care.
Can exercise help osteoarthritis even if it sometimes hurts?
Exercise is recommended for diagnosed hand, hip, and knee osteoarthritis and may improve pain and function, but there is no universally accepted pain level that applies to everyone. Use common-sense shared decision-making with your treating clinician, and do not interpret the guidance as permission to ignore new or severe pain.
The Bottom Line
Stop the painful movement, then reduce time, frequency, or intensity or choose another activity that causes little or no pain. Use a wrapped cold pack briefly for comfort if appropriate. Persistent, worsening, limiting, or unexplained pain deserves clinical review; severe pain, inability to bear weight, major swelling or deformity, locking, or fever with a hot/red joint needs urgent care.
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