Stringhalt is not a pain-driven condition. According to the UC Davis Center for Equine Health, “stringhalt is not a reaction to pain, so affected horses are not necessarily uncomfortable.” The involuntary hyperflexion you see, where a horse snaps its hind leg up sharply toward its belly, is a neurological misfiring rather than a response to something that hurts. That said, severe cases can create secondary problems that do cause discomfort, so the full picture is more nuanced than a simple no.
Why Stringhalt Looks Painful but Isn’t
Stringhalt is a nerve disorder, not a musculoskeletal injury. Veterinary research has identified damage in the peripheral nerves of the hind limbs, specifically the nerves that control movement from the hip down through the lower leg. This damage causes the muscles to fire excessively and involuntarily, pulling the hock up much higher than normal during each stride. The horse isn’t reacting to a sore spot or flinching from pain. Its nervous system is simply sending the wrong signals to the muscles.
This is an important distinction. Many gait abnormalities in horses, like a head bob or shortened stride, are directly caused by pain somewhere in the limb. Stringhalt is different. The exaggerated movement is a reflex gone haywire, which is why veterinarians now sometimes call it “equine reflex hypertonia” instead.
When Severe Cases Do Cause Discomfort
While the underlying condition isn’t painful, severe stringhalt can lead to secondary injuries that are. In bad cases, the hoof gets lifted sharply all the way to the belly and then forcefully stomped back down. The concussive forces from that repeated impact can damage the hoof, joints, and soft tissues of the lower leg over time. A horse dealing with this kind of repeated trauma may develop soreness in the fetlock, hoof, or even the muscles of the upper leg that are being forced through an extreme range of motion hundreds of times a day.
There’s also the issue of muscle fatigue. When muscles are contracting involuntarily and far more intensely than they should be, the horse can develop stiffness and general soreness, particularly after exercise or cold weather, both of which tend to make stringhalt symptoms worse.
Two Types of Stringhalt
Stringhalt comes in two main forms, and the distinction matters for prognosis. Classical (or idiopathic) stringhalt typically affects one hind leg, has no known cause, and tends to be a lifelong condition. It can range from barely noticeable to severe, and it often worsens with excitement, cold temperatures, or sudden changes in direction.
The pasture-associated form, sometimes called Australian stringhalt, usually affects both hind legs and is linked to grazing on certain weeds, most notably a plant called catsear (sometimes mistaken for dandelion). This form can affect multiple horses in the same paddock. The good news is that it often improves significantly once the horse is removed from the offending pasture, though recovery can take weeks to months depending on the severity of nerve damage.
How Stringhalt Differs From Similar Conditions
If your horse has an abnormal hind-leg movement, stringhalt isn’t the only possibility. A condition called shivers can look similar at first glance, but there are reliable ways to tell them apart. A horse with shivers holds the affected limb out and away from the body, while a stringhalt horse pulls the limb forward and tucks it under the body. Horses with shivers have the most trouble turning, stepping over objects, or transitioning between surfaces. Their forward trot usually looks relatively normal. Stringhalt horses, by contrast, show the abnormal movement most clearly at the walk and trot.
Another key difference: horses with stringhalt can back up normally, while horses with shivers often struggle to. A thorough lameness and neurological exam can help your vet distinguish between the two and rule out other causes, including “false stringhalt,” which is a temporary exaggerated gait caused by an actual painful lesion in the foot or pastern area. In false stringhalt, treating the underlying pain resolves the gait issue entirely.
Treatment and Quality of Life
For pasture-associated stringhalt, the first step is removing the horse from the problem pasture. Medication that reduces excessive nerve activity can help improve symptoms and get horses back into exercise during recovery. Many horses with this form make a full or near-full recovery over time.
Classical stringhalt is harder to manage. Surgical removal of a section of tendon in the affected leg (called a lateral digital extensor tenectomy) is the most common intervention and can significantly reduce the severity of the gait abnormality. The same nerve-calming medication used for pasture-associated cases can also help reduce symptoms, though results vary.
Many horses with mild to moderate stringhalt live comfortable lives and can still be ridden. The condition itself doesn’t cause the kind of chronic pain that would compromise their welfare. The horses most at risk for discomfort are those with severe, untreated cases where the repeated concussive impact of stomping creates ongoing physical stress on the limb. For those horses, reducing the severity of the hyperflexion, whether through surgery, medication, or management changes, directly improves their comfort.