Knee osteoarthritis symptoms often fluctuate. A painful flare can feel like something has suddenly gone wrong, but flares are common and do not always mean the joint has been damaged further.

A good flare plan helps you respond without either ignoring pain or stopping everything.

Step 1: Reduce the spike, not all movement

During a flare, temporarily reduce the activities that clearly aggravate the knee: long walks, hills, stairs, deep squats, kneeling or heavy lifting. Keep gentle movement if you can, because complete rest often leads to more stiffness.

Shorter, flatter walks or cycling may be better tolerated than pushing through the usual routine.

Step 2: Use simple symptom control

Heat or ice, pacing, compression, a walking aid for a short period, and appropriate medication advice can help. Medication choices depend on your medical history, so they should not be copied from someone else.

Step 3: Restart strength gradually

Once the flare settles, rebuilding strength around the knee matters. The quadriceps, hip muscles and calf all influence knee load. Exercises should start at a tolerable level and progress slowly.

Step 4: Look for the trigger

Common triggers include a sudden jump in walking volume, new shoes, travel, illness, poor sleep, kneeling, heavier work or a gap in strengthening. Identifying the trigger helps reduce future flares.

When injections fit

Cortisone may help selected inflammatory flares in the short term. PRP may be discussed in some cases, but the evidence is mixed and expectations should be realistic. Neither replaces exercise, weight management where relevant, or pacing.

You can read more on our knee osteoarthritis page.

The bottom line

A flare is a signal to adjust load, not necessarily a reason to stop moving. The aim is to calm the knee, then rebuild.