This remedy, is prescribed for bad effects , either recent or remote, from all heavy blows, falls. For pains due to overexertion. Rheumatism following muscular strain. It is also useful in injuries caused to any part of the body in accidents of any kind.

A person who lost his voice after an accident could be cured by Arnica 1000 potency even after a year of accident.  In fact, it is useful for  any abnormal symptoms that appear after some accident, even for impotency or phobia. 

Many homeopathic medicines don't respond to the present symptoms but acts well if prescribed on the conditions/symptoms at the beginning  of ailment. 

Who is sick?