A sprained ankle occurs when the tough bands of tissue that connect bones, known as ligaments, are stretched or torn. While pain, swelling, and bruising are common symptoms after such an injury, many individuals also experience a surprising sensation: itching. This itching is a frequent part of the recovery process, though it can be uncomfortable and confusing.
The Body’s Healing Response
Itching after a sprained ankle is linked to the body’s tissue repair processes. Following injury, the body initiates an inflammatory response to clean and rebuild the area. This increases blood flow, bringing cells and mediators for healing.
During this inflammatory phase, mast cells release chemicals, including histamine. Histamine widens blood vessels, supporting healing, but also stimulates nerve endings, leading to itching. As the ankle progresses through healing, new nerve endings regenerate in damaged tissues. These newly formed nerve fibers can be highly sensitive, contributing to the persistent itchy feeling.
External Factors and Itching
Beyond internal biological processes, external elements also contribute to itching around a sprained ankle. If the ankle is immobilized with a cast or brace, the skin underneath can become dry due to reduced air circulation. This dryness can lead to flaking and irritation, which commonly causes itching.
Materials of casts, braces, or bandages can also cause skin irritation through rubbing or chafing. Trapped sweat and moisture underneath these coverings create a warm, damp environment that can promote skin irritation. Individuals may experience a mild skin reaction to adhesives in tapes or materials like latex or certain fabrics. These reactions, often contact dermatitis, can manifest as redness and itching.
When Itching Signals a Problem
While itching is often a normal part of healing, certain signs indicate a more concerning issue, such as an infection. Monitor the injured area for changes that suggest a problem.
Signs that warrant immediate medical attention include increasing redness or warmth around the ankle, the presence of pus or discharge, or a foul odor emanating from the area. Worsening pain unresponsive to typical pain relief, or a fever, also indicate potential infection. If itching becomes severe, spreads beyond the injury site, or is accompanied by a worsening rash, consult a healthcare provider.
Relief Strategies
Managing itching associated with a sprained ankle often involves simple, safe strategies. Applying a cool compress or an ice pack to the affected area, even over a cast, can help soothe the sensation. If the skin is not covered by a cast, regularly moisturizing it can help alleviate dryness that contributes to itching.
To avoid damaging the skin, gently tapping or rubbing around the itchy area rather than scratching directly can provide relief. If a cast is present, using a hairdryer on a cool setting to blow air into the cast can help circulate air and dry trapped moisture. Over-the-counter anti-itch creams containing hydrocortisone can be applied to accessible skin. Oral antihistamines may also help reduce itching, particularly if there’s an allergic component. Consult a doctor before using them, especially if other medications are being taken.