06/11/2026
⚠⚠⚠ Atypical Myopathy ⚠⚠⚠
Unfortunately we have seen our first case of atypical myopathy this autumn, and speaking to our colleagues at referral hospitals across the UK, we are hearing that they have already seen numerous cases (more than in recent years). Atypical myopathy is a severe and often fatal muscle disorder caused by ingesting sycamore seeds, leaves or seedlings
We recommend you check your grazing areas carefully (seeds can be blown in over a significant distance) and are mindful of the symptoms to look out for:
- General weakness : horses struggle to walk, stand and breathe
- Horses appear depressed with low hanging heads
- Muscle trembling
- Signs of severe colic - yet, unlike colic, they still have an appetite
- Brown or dark red urine
- Severely affected horses become unable to stand
Please contact your vet as an emergency if you have any concerns.
For more info, see the BHS factsheet here: https://www.bhs.org.uk/horse-care-and-welfare/health-care-management/horse-health/equine-diseases/atypical-myopathy/