How can a sprain be cured?

R.I.C.E. and time: A sprain will heal given time. To alleviate symptoms in the acute period, r.I.C.E. Rest, ice, compression, elevation. Oral anti-inflammatories may help with swelling/pain. Once the swelling has decreased, begin working on range of motion. Gently progress to strengthening and gradually return to activities as tolerated.

Multifactorial: R.I.C.E. Rest, ice, compression, elevation. Immobilization with a splint or brace may be of benefit in the initial phase of recovery. Oral anti-inflammatory medication may help with the pain and swelling. Once improved, mobilization and physical therapy can help restore strength and function.

Rest, sunshine: Rest, ice/heat whichever feels better, bracing. Getting 30-60 min of sunshine at noon time for faster recovery and pain relief since Vitamin D is a healing and anti-inflammatory hormone. Alternatively, take vit D3 10k IU/day for 1-2 months.