Carpal tunnel syndrome occurs when pressure within the wrist restricts the function of the median nerve, leading to numbness, tingling, pain, and eventually weakness in the parts of the palm, thumb, index, middle and thumb-side of the ring finger. Management focuses on reducing pressure inside the carpal tunnel, which may include manual therapies, exercises, and activity modifications designed to decrease inflammation and help the tendons passing through the wrist glide more freely. In some cases, addressing hormonal or metabolic factors that contribute to inflammation, water retention, or impaired nerve health may also be necessary. One of the simplest and most effective strategies is using a wrist brace at night. But why is this so commonly recommended in clinical guidelines?

A key point is that the shape of the carpal tunnel is not fixed. The carpal bones form a concave arch, and the transverse carpal ligament forms the roof of the tunnel. When the wrist bends out of neutral alignment, the arch narrows and compresses the structures inside. These pressure increases are not subtle. A wrist positioned just 30 degrees into flexion or extension can triple pressure inside the carpal tunnel. At the extremes of flexion or extension, pressures can increase ten-fold. Even side-to-side wrist deviation can double or triple pressure on the median nerve and surrounding tendons. Not only does this directly stress the median nerve, but using the fingers while the wrist is bent causes the flexor tendons to generate heat and friction in a crowded space, which can promote inflammation and worsen symptoms.

During waking hours, we can consciously monitor our hand positions and adjust our activities to avoid these high-pressure postures. Overnight, however, this is impossible. Many patients with carpal tunnel syndrome experience sleep disturbances because their wrists naturally drift into prolonged flexion or extension while they sleep. A nocturnal wrist brace prevents this by keeping the wrist in a neutral, nerve-friendly position. Most braces look like a soft short arm cast that supports the wrist from the palm to the mid-forearm and prevents bending.

Wearing such a brace during the day would be impractical and could interfere with manual tasks—and continuous daytime bracing may even cause irritation where the ends of the brace contact the skin. For daily activity, other types of bracing and non-bracing options are more appropriate, such as ergonomic modifications for work tasks and using a soft, beanbag or memory-foam wrist support during computer use to reduce carpal tunnel pressure. However—and your chiropractor will likely emphasize this—over-reliance on bracing can hinder long-term recovery, as the muscles controlling the hand and fingers can weaken without regular use. That’s why it’s important to pair nighttime bracing with prescribed wrist exercises, frequent breaks, avoidance of extreme wrist postures, and healthy lifestyle habits that reduce systemic inflammation.