Piriformis Pain After Running: Why It Flares Up and How to Keep Running

A deep ache in one buttock after a run, sometimes the next morning, sometimes during the last kilometres. In many runners, the piriformis is the muscle complaining.

The good news: most people do not need to stop running completely. They need to find what overloaded the muscle and change that.

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Written by Velion Physique. Working in the fitness industry since 2019, with five German trainer licences including Medical Fitness Training (A) and Back Training (A).

Why running irritates the piriformis

Every running stride is a short single-leg stance. The hip has to stop the pelvis from dropping and the knee from rolling inward. That is mainly the job of the gluteus medius and gluteus maximus. The piriformis helps as a small hip rotator and stabiliser.

When the bigger glutes are weak or tired, the piriformis picks up more of the work, stride after stride. Add a sudden jump in volume and the muscle gets irritated. Because the sciatic nerve runs right next to it, the ache can spread down the back of the thigh.

Common triggers

• A sudden jump in distance or speed, such as more kilometres, a new interval session or race preparation.
• Lots of hills or a cambered road, which loads one hip more than the other.
• Long sitting before or after the run. A desk day followed by an evening run is a classic combination; see buttock pain when sitting.
• Weak hip stabilisers. The weak glute medius guide has a quick self-check.
• Overstriding, landing far in front of the body, which increases the braking load on the hip.

How to keep running

Use pain as a guide. A mild ache that stays at the same level and has settled by the next morning is usually acceptable. Pain that increases during the run, makes you limp or is worse the next day means the load is too high.

• Reduce, do not quit. Cut distance or intensity for one to two weeks, often by around a third, and keep runs flat and easy.
• Swap the hardest session for cycling or walking, which usually load the piriformis less.
• Shorten your stride slightly and take a few more steps per minute. This reduces the load per step.
• Break up the sitting on run days. Getting up every 45 minutes matters more than a long stretch afterwards.
• Build back gradually. Increase volume only once easy runs feel normal again.

What to strengthen

Stretching the piriformis can calm it down, but strength decides whether it stays calm. Twice a week, around 10 to 15 minutes:

• Side-lying leg raise for the gluteus medius, slow and controlled
• Glute bridge, progressing to the single-leg version
• Clamshell with a light band
• Single-leg balance, keeping the pelvis level in front of a mirror

Full instructions are in the piriformis exercise guide. For quick relief after a run, a few minutes on a massage ball often helps.

When to stop and get it checked

• numbness in the saddle area, or problems controlling bladder or bowel
• a weak or dragging foot
• pain that shoots below the knee into the foot, or gets worse when you cough or sneeze
• pain that wakes you at night, or no improvement after a few weeks of reduced load

The first two are an emergency. Not sure it is even the piriformis? The piriformis self-check walks through the typical signs.

Structured version: the daily sciatic tension routine covers glutes, hip and lower back in order, as a printable PDF. If the hip itself feels tight, the hip mobility routine fits better.

Free starting point: the 7-Minute Desk Reset.

This is general movement education, not medical advice, diagnosis or treatment. A trainer licence is not a medical qualification. If symptoms persist or worsen, see a doctor or physiotherapist.

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