Hot & cold. Tried and true ice and heat modalities still prove effective for acute and chronic pain.
Carlson
Ann H
AH
D000208:Acute Disease; D002908:Chronic Disease; D003080:Cold Temperature; D017679:Cryotherapy; D006358:Hot Temperature / Q000627:therapeutic use*; D006801:Humans; D059408:Pain Management; D026741:Physical Therapy Modalities