How long does it take for a hot compress to be effective after a stiff neck?
In general, applying heat for 15–20 minutes is effective after sleeping wrong. If discomfort persists, it is recommended to seek timely treatment at a qualified hospital. Detailed analysis is as follows:
If the symptoms of sleeping wrong are mild, such as slight neck muscle spasm, mild soreness without significant swelling, applying heat for 15 minutes is usually effective. At this stage, the degree of restricted blood circulation in the neck area is relatively minor, and a 15-minute warm stimulation is sufficient to promote local blood circulation, relieve muscle tension, alleviate discomfort, and restore some neck flexibility.
If the symptoms are relatively severe, including significant neck muscle spasm, intense soreness, and even mild swelling, applying heat for 20 minutes is more effective. In such cases, the neck muscles and soft tissues are more tense and stiff, requiring a longer duration of warmth to penetrate deeper tissues, improve blood circulation more thoroughly, relieve muscle spasms, and effectively reduce pain and limited mobility.
During heat application, ensure the temperature is appropriate to avoid burns; a hot water bag wrapped in a towel or a warm towel can be used. It is recommended to apply cold compress first within the first 48 hours of the injury, and then switch to heat application after 48 hours to avoid exacerbating local inflammation. Discontinue heat application immediately if discomfort or worsening symptoms occur. If symptoms persist or worsen, seek timely medical evaluation.