I am having a pain in my left calf. while running i got something blew in my calf. what could be the reason? will it heal by stretching and rest?

Calf pain: You have either a significant muScle sprain or a tear. The plantaris muscle can tear relatively easily. Ice this area. Yes it will heal but accurate dx is important. Rest is essential.

May be muscle tear: Your history suggests an injury to the calf and would suspect Tear of the medial head of the gastrocnemius or soleus strain but it could be a different injury. You need to see your physician to get the definite diagnosis and then appropriate designed therapy. With the initial injury would ice the tender area, limit stretch and muscle contraction -not stretch, ACE wrap, leg elevation. Then

Possible tear: It sounds as though you might have torn, partially or fully, a tendon or muscle belly in the calf. You need to consult with an orthopedist if the pain persists , as tendon tears sometimes occur and must be re sewn together within a specified period of time to be successful.